Compliance of biosecurity practices for compartmentalization to foot-mouth disease and classical swine fever viruses in commercial swine companies from southern Brazil.

Classical swine fever (CSF) and foot-mouth disease (FMD) are both highly contagious disease and disruptive to commercial trades, but they are examples of foreign animal diseases that biosecurity-based compartmentalization could be used to support trade in free zones in response to an outbreak. This study aimed to evaluate biosecurity compliance to the Federal Normative Instruction #44 from December 4th, 2017 (BRAZIL, 2017) in commercial swine farms located in southern Brazil. A total of 604 swine farms from 10 commercial swine companies were sampled, from which 28.5% were breeding farms, 29.1% nursery, 32.8% finishing, 6.8% multipliers, and 2.8% farrow-to-finish. Cluster analyses revealed that farms with high compliance (n = 303, Cluster 1) performed 71% of the practices, moderate (n = 219, Cluster 2) 47%, and the low (n = 82, Cluster 3) 33%. A spatial logistic regression model estimated that biosecurity compliance was highest in only one of 10 commercial swine companies, and within a company, multipliers (when present) obtained the highest biosecurity compliance (p-value < 0.01). These results suggest that major improvements in biosecurity practices are needed in breeding herds, nursery, and grow-finish farms to be compliant to the Federal Instruction #44. Based on the combination of these analyses, only one commercial swine company was more suitable to establish compartments for CSF and FMD with minimal investments. Still, this study revealed that the majority of commercial swine companies needs to improve biosecurity practice protocols to then target compartmentalization.

Lanthanide Contraction in Lanthanide Organic Frameworks: A Theoretical and Experimental Study.

In this work, the lanthanide (Ln) contraction phenomenon has been analyzed for three-dimensional structures in the solid state. We chose to study an isostructural series of lanthanide organic frameworks (LOFs) of formula [Ln2(C4H4O4)3(H2O)2]n·H2O and 14 crystallographic structures (except promethium complex). The analysis of Ln contraction was made by analyzing the sum of all Ln-O bond lengths and the sum of all O-O distances, for the oxygen atoms of the coordination polyhedra, calculated with different semiempirical quantum mechanical models. The ∑Ln-O and ∑O-O for this LOF can be fit to a second-order polynomial. Based on the crystallographic structures, it is concluded that the phenomenon of Ln contraction is observed. Our results also suggest that the semiempirical Sparkle/PM3 and Sparkle/RM1 models reproduce the Ln contraction phenomenon well, and similar fits were obtained for ∑Ln-O and ∑O-O bond lengths.

Survey for pestiviruses in backyard pigs in southern Brazil.

The Pestivirus genus comprises species that affect animal health and productivity worldwide. Members of the Suidae family are hosts for classical swine fever virus (CSFV), an important pathogen tracked by the World Organization for Animal Health (OIE). However, swine are also susceptible to other pestivirus species that can result in disease or compromise CSFV detection. We searched for pestivirus infection in swine sera collected from 320 backyard pig herds in southern Brazil. We used reverse-transcription PCR primers for Bungowannah virus; atypical porcine pestivirus (APPV); and a panpestivirus pair that detects bovine viral diarrhea virus (BVDV)-1, -2, and HoBi-like pestivirus (HoBiPeV), border disease virus (BDV), and CSFV. Two samples were positive using the panpestivirus primer pair and were classified as BVDV-1d and -2a, respectively. Serum samples were tested for virus neutralization against BVDV-1a, -1b, and -2 strains, resulting in 28 (4.4%) positive samples. Of those, 16 samples had the highest titers against BVDV-1a (2), BVDV-1b (5), and BVDV-2 (9). Our results indicate that Bungowannah virus, APPV, CSFV, BDV, and HoBiPeV have not been circulating in these specific backyard swine populations. However, ruminant pestiviruses were detected and must be considered in future pestivirus control programs conducted in Brazil.

Study of the potential adverse effects caused by the dermal application of Dillenia indica L. fruit extract standardized to betulinic acid in rodents.

This study aimed to evaluate the potential adverse effects of the dermal administration of Dillenia indica Linnaeus (D. indica) fruit extract in healthy rodents; the extract was standardized to betulinic acid. In the initial phase, the acute effects were evaluated on the skin application site of a single extract dose. A skin irritation test was performed in male Wistar rats (n = 8/group) receiving the extract (50-150 mg/mL) with betulinic acid (0.5-1.5%, respectively). A photosensitivity test was performed in male BALB/c mice (n = 6/group) receiving the extract (150 mg/mL). Afterwards, other BALB/c mice (n = 20, male:female, 1:1) were used to assess the systemic alterations caused by 14 daily repeated doses (150 mg/mL) by monitoring the effects on mortality, body morphology, behavior, nutrition status, neuromotor reactions, organ morphology and weight, and blood tests. At this time, 0.5 mg/mL clobetasol was used as the positive control. The skin irritation index suggested that negligible skin irritation had occurred, even when the extract was applied to the rat skin at 150 mg/mL. However, the extract acted as a photosensitizer on mouse skin, showing a photosensitizing activity close to that of 10 mg/mL 5-methoxypsoralen. Repeated doses caused no mouse mortality, aggressiveness, piloerection, diarrhea, convulsions, neuromotor alterations or nutrition status changes. The mouse organ weights did not change, and the mice did not have alterations in their blood compositions. Clobetasol caused a reduction in the mononuclear leukocyte numbers. In general, the data suggest that the extract was safe in healthy rodents but indicate that caution should be taken with the photosensitizing activity; in addition, this activity should be further explored as it may be useful for phototherapeutic drug development.

Assessment of biosecurity practices and development of a scoring system in swine farms using item response theory.

Brazil is the fourth largest producer and exporter of pork in the world, but has never reported yet the occurrence of some economically important diseases such as porcine reproductive and respiratory syndrome (PRRS) and porcine epidemic diarrhea (PED). Most of the swine farms in Brazil are characterized by intensive production being part of large integrated companies, where biosecurity practices help to prevent the introduction and spread of disease-causing infectious agents. The assessment of biosecurity in farms is not straightforward because of the large number of practices that constitute an on-farm biosecurity program. It is therefore necessary to combine the measurement of several parameters in order to characterize the level of biosecurity on a given farm. Thus, the objective of the study was to develop a biosecurity score to estimate the biosecurity level (theta or θ) in swine farms using the item response theory (IRT) and explore the relationship between the scores and independent variables. The IRT is a latent trait method extensively used in other fields, and offers the advantage to quantify the latent trait, here the biosecurity level, and to identify the practices that discriminate the farms avoiding the use of extensive questionnaires and redundant questions. In this study, 604 farms were evaluated in the main swine production regions of the state of Rio Grande do Sul, Brazil. Thirty-five practices were considered in order to quantify the biosecurity level on a given farm. After a recursive process 14 practices were selected to compose the biosecurity score to estimate the biosecurity level (θ). The variables identified with greater capacity of distinguishing the farms as to their biosecurity level were if the farm has 'feed bin outside of the barn limit (external feed loading)', has 'perimetral fence around the farm or barn', and if 'transit of trucks inside the farm is prohibited'. The biosecurity level was associated with some independent variables, e.g. the farm operation type, the integrated company and some owner characteristics. In addition, the results demonstrated that biosecurity practices related to management (internal biosecurity) are adopted with higher frequency compared to segregation and sanitation practices (external biosecurity). The IRT model proved useful and valid to estimate the biosecurity level in swine farms. Moreover, the biosecurity score described here has a relatively low number of items, which makes the application of this tool easier and faster compared to other previously described biosecurity assessment.

Development and validation of a scoring system to assess the relative vulnerability of swine breeding herds to the introduction of PRRS virus.

Biosecurity is defined as the set of practices carried out to prevent the introduction and spread of infectious agents in a herd. These practices are essential in swine production, especially for highly infectious agents such as porcine reproductive and respiratory syndrome virus (PRRSv). Even with years of research and experience over the last three decades, PRRSv is still causing productivity losses and is the major health problem affecting the global swine industry. Despite knowledge of the various ways in which the virus can be transmitted from one herd to another (e.g. animals, semen, truck, air, and people), determining the most frequent ways in which the virus is transmitted in the field is difficult. A systematic approach to assess vulnerabilities at a herd level related to PRRSv transmission could help producers prioritize biosecurity practices to reduce or avoid the occurrence of outbreaks. The aim of this study was to develop a biosecurity vulnerability score that represents the relative vulnerability of swine breeding herds to the introduction of PRRSv. To create the biosecurity vulnerability score (outcome), a multi-criteria decision analysis methodology was used to rank and quantify biosecurity practices based on expert opinion. To validate the biosecurity vulnerability score, a survey of biosecurity practices and PRRS outbreak histories in 125 breed-to-wean herds in the U.S. swine industry was used. Data on the frequency of PRRS outbreaks was used to test the hypothesis that biosecurity vulnerability scores were different between farms that have a low incidence of PRRS outbreaks, compared to farms that have a high incidence. In the two databases used, the scores consistently showed that farms with higher scores have a higher frequency of PRRS outbreaks. In the first validation, farms that had never had an outbreak investigation before had a significant (p < 0.02) lower score (0.29; 0.21-0.37) when compared to farms that had 2 or more outbreaks (0.43; 0.39-0.46). In the second, the farms of the control group also had significant (p < 0.004) lower scores (0.30; 0.27-0.33) compared to the case group (0.35; 0.33-0.38). Also, the results suggest that events related to swine movements, transmission by air and water, and people movements should be prioritized. The biosecurity vulnerability scores may be useful to assess vulnerabilities on biosecurity protocols in order to reduce the frequency of PRRS outbreaks and may help producers and veterinarians prioritize investments in improving biosecurity practices over time.

Neoplasmas cutâneos em cães: 656 casos (2007-2014) em Cuiabá, MT / Cutaneous neoplasms in dogs: 656 cases (2007-2014) from Cuiabá, MT

Os neoplasmas cutâneos em cães apresentam elevada e relevante prevalência em todo o Brasil. Sendo assim, objetivou-se determinar a frequência e algumas características epidemiológicas dos neoplasmas cutâneos em cães diagnosticados no Laboratório de Patologia da Universidade Federal de Mato Grosso (LPV-UFMT), Cuiabá, entre os anos de 2007 a 2014. Foram revisados os protocolos de necropsias e biopsias do LPV-UFMT, de cães com neoplasmas cutâneos. Dados referentes à idade, sexo, raça dos cães afetados, localização anatômica, tamanho, diagnóstico histomorfológico e comportamento biológico foram coletados e analisados através de uma análise estatística descritiva. Adicionalmente o teste χ2, foi utilizado para associações entre comportamento biológico e tamanho da massa. Dos 3566 exames realizados, 656 (18,4%) foram diagnosticados como tumores cutâneos sendo cães adultos e idosos das raças Pit Bull, Boxer e Poodle os mais acometidos. Dentre os 11 padrões morfológicos mais diagnosticados o mastocitoma, carcinoma de células escamosas (CCE) e os tumores de origem vascular foram os mais frequentemente relatados. Em relação ao sítio anatômico, a cabeça foi a mais acometida. A maioria dos tumores benignos apresentaram menos de 1cm de diâmetro e os malignos de 3 a 5cm. O aumento de neoplasmas em adultos e idosos pode estar relacionado ao somatório de danos causados por agentes carcinogênicos e o comprometimento imunológico.(AU)

Canine cutaneous neoplasms present high and relevant prevalence throughout Brazil. Here we determine the frequency and epidemiological characteristics of canine cutaneous neoplasms in dogs diagnosed at the Laboratory of Veterinary Pathology of the Federal University of Mato Grosso (LPV-UFMT), Cuiabá, from 2007 to 2014. The necropsy and biopsy protocols from canine cutaneous neoplasms diagnosed at the LPV-UFMT were reviewed. Data regarding age, sex, breed of affected dogs, anatomical location, size, histomorphological diagnosis and biological behavior of the tumors were evaluated through a descriptive statistical analysis. In addition, the χ2 test was used for associations between biological behavior and mass size. Of the 3566 examinations performed, 656 (18.4%) were diagnosed as cutaneous tumors being adult and old dogs of Pit Bull, Boxer and Poodle races most affected. Among the diagnoses, 11 morphological patterns were the most prevalent, being mastocytoma, squamous cell carcinoma (SCC) and tumors of vascular origin most frequently reported. In relation to the anatomical site, the head was the most affected. Most of the benign tumors were less than 1cm in diameter and the malignant were 3 to 5cm. The increase of neoplasms in adults and old age dogs may be associated to the sum of damage caused by carcinogenic agents and the immunological impairment.(AU)

Neoplasmas cutâneos em cães: 656 casos (2007-2014) em Cuiabá, MT / Cutaneous neoplasms in dogs: 656 cases (2007-2014) from Cuiabá, MT

Os neoplasmas cutâneos em cães apresentam elevada e relevante prevalência em todo o Brasil. Sendo assim, objetivou-se determinar a frequência e algumas características epidemiológicas dos neoplasmas cutâneos em cães diagnosticados no Laboratório de Patologia da Universidade Federal de Mato Grosso (LPV-UFMT), Cuiabá, entre os anos de 2007 a 2014. Foram revisados os protocolos de necropsias e biopsias do LPV-UFMT, de cães com neoplasmas cutâneos. Dados referentes à idade, sexo, raça dos cães afetados, localização anatômica, tamanho, diagnóstico histomorfológico e comportamento biológico foram coletados e analisados através de uma análise estatística descritiva. Adicionalmente o teste χ2, foi utilizado para associações entre comportamento biológico e tamanho da massa. Dos 3566 exames realizados, 656 (18,4%) foram diagnosticados como tumores cutâneos sendo cães adultos e idosos das raças Pit Bull, Boxer e Poodle os mais acometidos. Dentre os 11 padrões morfológicos mais diagnosticados o mastocitoma, carcinoma de células escamosas (CCE) e os tumores de origem vascular foram os mais frequentemente relatados. Em relação ao sítio anatômico, a cabeça foi a mais acometida. A maioria dos tumores benignos apresentaram menos de 1cm de diâmetro e os malignos de 3 a 5cm. O aumento de neoplasmas em adultos e idosos pode estar relacionado ao somatório de danos causados por agentes carcinogênicos e o comprometimento imunológico.(AU)

Canine cutaneous neoplasms present high and relevant prevalence throughout Brazil. Here we determine the frequency and epidemiological characteristics of canine cutaneous neoplasms in dogs diagnosed at the Laboratory of Veterinary Pathology of the Federal University of Mato Grosso (LPV-UFMT), Cuiabá, from 2007 to 2014. The necropsy and biopsy protocols from canine cutaneous neoplasms diagnosed at the LPV-UFMT were reviewed. Data regarding age, sex, breed of affected dogs, anatomical location, size, histomorphological diagnosis and biological behavior of the tumors were evaluated through a descriptive statistical analysis. In addition, the χ2 test was used for associations between biological behavior and mass size. Of the 3566 examinations performed, 656 (18.4%) were diagnosed as cutaneous tumors being adult and old dogs of Pit Bull, Boxer and Poodle races most affected. Among the diagnoses, 11 morphological patterns were the most prevalent, being mastocytoma, squamous cell carcinoma (SCC) and tumors of vascular origin most frequently reported. In relation to the anatomical site, the head was the most affected. Most of the benign tumors were less than 1cm in diameter and the malignant were 3 to 5cm. The increase of neoplasms in adults and old age dogs may be associated to the sum of damage caused by carcinogenic agents and the immunological impairment.(AU)

Bone quality evaluation of experimental osteometabolic disease in Pantanal alligators (Caiman yacare) by High Resolution Computerized Microtomography (µCT) / Avaliação da qualidade óssea de doença osteometabólica experimental em jacarés do pantanal (Caiman yacare) por Microtomografia Computadorizada (µCT)

Computerized microtomography is the gold standard examination for the evaluation of the three-dimensional bone structure. This experiment was developed to evaluate the structure and bone quality of Caiman yacare with metabolic bone disease using high resolution computerized microtomography (μCT). The animals were distributed into four groups: G1 - hyperphosphatemic diet with sun exposure deprivation (n=4), G2 - hyperphosphatemic diet with sun exposure (n=4), G3 - balanced diet with sun exposure deprivation (n=4), and G4 - balanced diet with exposure to sunlight (n=4). The parameters for the trabecular bone (Trabecular Number, Trabecular Thickness, Trabecular Separation, Bone Pattern Factor, Fractal Dimension, Euler Number, Structural Model Index, Degree of Anisotropy, Eigenvalues 1, 2 and 3, and Centroides X, Y and Z), and cortical bone (Number of Closed Pores, Volume of Closed Pores, Surface of Closed Pores, Closed Porosity, Volume of Open Pores, Open Porosity and Total Porosity). The overall results showed that the structure and bone quality of group G3 and G4 were better than those of groups G1 and G2, and that the diet factor influenced more than the sun exposure factor. The computerized microtomography allowed to evaluate the quality of the cortical and trabecular bones of the Pantanal alligator tibia with osteometabolic disease. The diet and sun exposure factors influenced individually the results of the μCT parameters between the groups, demonstrating the functional and structural complexity. Thus, these parameters can contribute to the interpretation of the mechanical behavior of bones and correlate them with the risk of lesions and fractures associated with osteometabolic diseases.(AU)

Microtomografia computadorizada é o exame padrão-ouro para a avaliação da estrutura tridimensional do osso. Este estudo experimental foi desenvolvido para avaliar a estrutura e a qualidade óssea de jacarés-do-pantanal (Caiman yacare) com doença óssea metabólica utilizando a microtomografia computadorizada (μCT) de Alta Resolução. Os animais foram distribuídos em quatro grupos, G1 - dieta hiperfosfatêmica com privação de luz solar (n=4), G2 - dieta hiperfosfatêmica com exposição à luz solar (n=4), G3 - dieta balanceada com privação de luz solar (n=4) e G4 - dieta balanceada com exposição à luz solar (n=4). Avaliaram-se os parâmetros para o osso trabecular (Número de Trabéculas, Espessura Trabecular, Separação Trabecular, Fator do Padrão Ósseo, Dimensão Fractal, Número de Euler, Índice do Modelo Estrutural, Grau de Anisotropia, Autovalores 1, 2 e 3 e Centroides X, Y e Z) e osso cortical (Número de Poros Fechados, Volume dos Poros Fechados, Superfície de Poros Fechados, Porosidade Fechada, Volume de Poros Abertos, Porosidade Aberta e Porosidade Total). Os resultados gerais evidenciaram que a estrutura e a qualidade óssea dos grupos G3 e G4 foram superiores aos dos grupos G1 e G2, sendo que o fator dieta influenciou mais do que o fator exposição solar. A Microtomografia Computadorizada permitiu avaliar a qualidade dos ossos cortical e trabecular da tíbia de jacarés do pantanal com doença osteometabólica. Os fatores dieta e exposição solar influenciaram individualmente no resultado dos parâmetros do μCT entre os grupos, demonstrando a complexidade funcional e estrutural. Assim, esses parâmetros podem contribuir na interpretação do comportamento mecânico dos ossos e correlacioná-los com o risco de lesões e fraturas associadas às doenças osteometabólicas.(AU)

Bone quality evaluation of experimental osteometabolic disease in Pantanal alligators (Caiman yacare) by High Resolution Computerized Microtomography (µCT) / Avaliação da qualidade óssea de doença osteometabólica experimental em jacarés do pantanal (Caiman yacare) por Microtomografia Computadorizada (µCT)

Computerized microtomography is the gold standard examination for the evaluation of the three-dimensional bone structure. This experiment was developed to evaluate the structure and bone quality of Caiman yacare with metabolic bone disease using high resolution computerized microtomography (μCT). The animals were distributed into four groups: G1 - hyperphosphatemic diet with sun exposure deprivation (n=4), G2 - hyperphosphatemic diet with sun exposure (n=4), G3 - balanced diet with sun exposure deprivation (n=4), and G4 - balanced diet with exposure to sunlight (n=4). The parameters for the trabecular bone (Trabecular Number, Trabecular Thickness, Trabecular Separation, Bone Pattern Factor, Fractal Dimension, Euler Number, Structural Model Index, Degree of Anisotropy, Eigenvalues 1, 2 and 3, and Centroides X, Y and Z), and cortical bone (Number of Closed Pores, Volume of Closed Pores, Surface of Closed Pores, Closed Porosity, Volume of Open Pores, Open Porosity and Total Porosity). The overall results showed that the structure and bone quality of group G3 and G4 were better than those of groups G1 and G2, and that the diet factor influenced more than the sun exposure factor. The computerized microtomography allowed to evaluate the quality of the cortical and trabecular bones of the Pantanal alligator tibia with osteometabolic disease. The diet and sun exposure factors influenced individually the results of the μCT parameters between the groups, demonstrating the functional and structural complexity. Thus, these parameters can contribute to the interpretation of the mechanical behavior of bones and correlate them with the risk of lesions and fractures associated with osteometabolic diseases.(AU)

Microtomografia computadorizada é o exame padrão-ouro para a avaliação da estrutura tridimensional do osso. Este estudo experimental foi desenvolvido para avaliar a estrutura e a qualidade óssea de jacarés-do-pantanal (Caiman yacare) com doença óssea metabólica utilizando a microtomografia computadorizada (μCT) de Alta Resolução. Os animais foram distribuídos em quatro grupos, G1 - dieta hiperfosfatêmica com privação de luz solar (n=4), G2 - dieta hiperfosfatêmica com exposição à luz solar (n=4), G3 - dieta balanceada com privação de luz solar (n=4) e G4 - dieta balanceada com exposição à luz solar (n=4). Avaliaram-se os parâmetros para o osso trabecular (Número de Trabéculas, Espessura Trabecular, Separação Trabecular, Fator do Padrão Ósseo, Dimensão Fractal, Número de Euler, Índice do Modelo Estrutural, Grau de Anisotropia, Autovalores 1, 2 e 3 e Centroides X, Y e Z) e osso cortical (Número de Poros Fechados, Volume dos Poros Fechados, Superfície de Poros Fechados, Porosidade Fechada, Volume de Poros Abertos, Porosidade Aberta e Porosidade Total). Os resultados gerais evidenciaram que a estrutura e a qualidade óssea dos grupos G3 e G4 foram superiores aos dos grupos G1 e G2, sendo que o fator dieta influenciou mais do que o fator exposição solar. A Microtomografia Computadorizada permitiu avaliar a qualidade dos ossos cortical e trabecular da tíbia de jacarés do pantanal com doença osteometabólica. Os fatores dieta e exposição solar influenciaram individualmente no resultado dos parâmetros do μCT entre os grupos, demonstrando a complexidade funcional e estrutural. Assim, esses parâmetros podem contribuir na interpretação do comportamento mecânico dos ossos e correlacioná-los com o risco de lesões e fraturas associadas às doenças osteometabólicas.(AU)

Neoplasmas cutâneos em cães: 656 casos (2007-2014) em Cuiabá, MT

ABSTRACT: Canine cutaneous neoplasms present high and relevant prevalence throughout Brazil. Here we determine the frequency and epidemiological characteristics of canine cutaneous neoplasms in dogs diagnosed at the Laboratory of Veterinary Pathology of the Federal University of Mato Grosso (LPV-UFMT), Cuiabá, from 2007 to 2014. The necropsy and biopsy protocols from canine cutaneous neoplasms diagnosed at the LPV-UFMT were reviewed. Data regarding age, sex, breed of affected dogs, anatomical location, size, histomorphological diagnosis and biological behavior of the tumors were evaluated through a descriptive statistical analysis. In addition, the 2 test was used for associations between biological behavior and mass size. Of the 3566 examinations performed, 656 (18.4%) were diagnosed as cutaneous tumors being adult and old dogs of Pit Bull, Boxer and Poodle races most affected. Among the diagnoses, 11 morphological patterns were the most prevalent, being mastocytoma, squamous cell carcinoma (SCC) and tumors of vascular origin most frequently reported. In relation to the anatomical site, the head was the most affected. Most of the benign tumors were less than 1cm in diameter and the malignant were 3 to 5cm. The increase of neoplasms in adults and old age dogs may be associated to the sum of damage caused by carcinogenic agents and the immunological impairment.

RESUMO: Os neoplasmas cutâneos em cães apresentam elevada e relevante prevalência em todo o Brasil. Sendo assim, objetivou-se determinar a frequência e algumas características epidemiológicas dos neoplasmas cutâneos em cães diagnosticados no Laboratório de Patologia da Universidade Federal de Mato Grosso (LPV-UFMT), Cuiabá, entre os anos de 2007 a 2014. Foram revisados os protocolos de necropsias e biopsias do LPV-UFMT, de cães com neoplasmas cutâneos. Dados referentes à idade, sexo, raça dos cães afetados, localização anatômica, tamanho, diagnóstico histomorfológico e comportamento biológico foram coletados e analisados através de uma análise estatística descritiva. Adicionalmente o teste 2, foi utilizado para associações entre comportamento biológico e tamanho da massa. Dos 3566 exames realizados, 656 (18,4%) foram diagnosticados como tumores cutâneos sendo cães adultos e idosos das raças Pit Bull, Boxer e Poodle os mais acometidos. Dentre os 11 padrões morfológicos mais diagnosticados o mastocitoma, carcinoma de células escamosas (CCE) e os tumores de origem vascular foram os mais frequentemente relatados. Em relação ao sítio anatômico, a cabeça foi a mais acometida. A maioria dos tumores benignos apresentaram menos de 1cm de diâmetro e os malignos de 3 a 5cm. O aumento de neoplasmas em adultos e idosos pode estar relacionado ao somatório de danos causados por agentes carcinogênicos e o comprometimento imunológico.

Bone quality evaluation of experimental osteometabolic disease in Pantanal alligators (Caiman yacare) by High Resolution Computerized Microtomography (CT)

ABSTRACT: Computerized microtomography is the gold standard examination for the evaluation of the three-dimensional bone structure. This experiment was developed to evaluate the structure and bone quality of Caiman yacare with metabolic bone disease using high resolution computerized microtomography (CT). The animals were distributed into four groups: G1 - hyperphosphatemic diet with sun exposure deprivation (n=4), G2 - hyperphosphatemic diet with sun exposure (n=4), G3 - balanced diet with sun exposure deprivation (n=4), and G4 - balanced diet with exposure to sunlight (n=4). The parameters for the trabecular bone (Trabecular Number, Trabecular Thickness, Trabecular Separation, Bone Pattern Factor, Fractal Dimension, Euler Number, Structural Model Index, Degree of Anisotropy, Eigenvalues 1, 2 and 3, and Centroides X, Y and Z), and cortical bone (Number of Closed Pores, Volume of Closed Pores, Surface of Closed Pores, Closed Porosity, Volume of Open Pores, Open Porosity and Total Porosity). The overall results showed that the structure and bone quality of group G3 and G4 were better than those of groups G1 and G2, and that the diet factor influenced more than the sun exposure factor. The computerized microtomography allowed to evaluate the quality of the cortical and trabecular bones of the Pantanal alligator tibia with osteometabolic disease. The diet and sun exposure factors influenced individually the results of the CT parameters between the groups, demonstrating the functional and structural complexity. Thus, these parameters can contribute to the interpretation of the mechanical behavior of bones and correlate them with the risk of lesions and fractures associated with osteometabolic diseases.

RESUMO: Microtomografia computadorizada é o exame padrão-ouro para a avaliação da estrutura tridimensional do osso. Este estudo experimental foi desenvolvido para avaliar a estrutura e a qualidade óssea de jacarés-do-pantanal (Caiman yacare) com doença óssea metabólica utilizando a microtomografia computadorizada (CT) de Alta Resolução. Os animais foram distribuídos em quatro grupos, G1 - dieta hiperfosfatêmica com privação de luz solar (n=4), G2 - dieta hiperfosfatêmica com exposição à luz solar (n=4), G3 - dieta balanceada com privação de luz solar (n=4) e G4 - dieta balanceada com exposição à luz solar (n=4). Avaliaram-se os parâmetros para o osso trabecular (Número de Trabéculas, Espessura Trabecular, Separação Trabecular, Fator do Padrão Ósseo, Dimensão Fractal, Número de Euler, Índice do Modelo Estrutural, Grau de Anisotropia, Autovalores 1, 2 e 3 e Centroides X, Y e Z) e osso cortical (Número de Poros Fechados, Volume dos Poros Fechados, Superfície de Poros Fechados, Porosidade Fechada, Volume de Poros Abertos, Porosidade Aberta e Porosidade Total). Os resultados gerais evidenciaram que a estrutura e a qualidade óssea dos grupos G3 e G4 foram superiores aos dos grupos G1 e G2, sendo que o fator dieta influenciou mais do que o fator exposição solar. A Microtomografia Computadorizada permitiu avaliar a qualidade dos ossos cortical e trabecular da tíbia de jacarés do pantanal com doença osteometabólica. Os fatores dieta e exposição solar influenciaram individualmente no resultado dos parâmetros do CT entre os grupos, demonstrando a complexidade funcional e estrutural. Assim, esses parâmetros podem contribuir na interpretação do comportamento mecânico dos ossos e correlacioná-los com o risco de lesões e fraturas associadas às doenças osteometabólicas.

Granuloma leproide canino: estudo de 27 casos / Canine leproid granuloma: study of 27 cases

O granuloma leproide canino (GLC) é uma doença micobacteriana que cursa com lesão nodular, cutânea ou subcutânea, tipicamente auto limitante, decorrente de infecção pelo Mycobacterium. É uma doença dermatológica rara, usualmente relatada em países de clima tropical. O objetivo deste trabalho é caracterizar as alterações microscópicas e epidemiológicas de casos de GLC. Além disso, utilizar exames complementares para demonstração do Mycobacterium sp. na lesão analisada utilizando coloração de Ziehl-Neelsen, imuno-histoquímica e PCR para classificação e sequenciamento da espécie de Mycobacterium. Foram analisados 27 casos de GLC diagnosticados no período compreendido de 2005 a 2014 (21 exames histológicos e seis citológicos). A raça mais acometida foi Boxer (33,3%), seguida da Dachshund (11,1%). Foi frequente o acometimento de caninos de grande porte (64%) e de pelame curto (96%). Não foi possível estabelecer qualquer padrão de sazonalidade do GLC. As lesões se localizaram anatomicamente no pavilhão auricular na maioria dos casos (93%), constituindo-se de nódulos únicos ou múltiplos, ulcerados ou não. Em nenhum dos casos foi observado acometimento sistêmico. Lesões histológicas seguiram três padrões que variaram de nodulares a difusos, com infiltrado granulomatoso/piogranulomatoso com envolvimento de derme superficial e profunda. A observação de bacilos pela coloração de Ziehl-Neelsen confirmou o diagnóstico. Este teste demonstrou grande variação na quantidade de bacilos nas lesões, não relacionado estatisticamente ao tipo da lesão nem ao período evolutivo. A imuno-histoquímica foi positiva em 90% dos casos, e em alguns casos facilitou a identificação de bacilos, entretanto, em dois casos ocorreram resultados negativos mesmo havendo marcação pela coloração de Ziehl-Neelsen. Na técnica de PCR realizada em 18 amostras, 44% dos casos foram positivos, duas sequências inespecíficas, e demonstrou ainda, que Mycobacterium murphy foi responsável por 2 casos e Mycobacterium hodleri em um caso. Em outros três casos não se obteve 100% de semelhança entre o produto sequenciado e os demais Mycobacterium.(AU)

Canine leproid granuloma (CLG) is cutaneous diseases caused by mycobacteria that course with nodular cutaneous or subcutaneous lesion, typically self-limiting, due to Mycobacterium infection. It is an unusual dermatological disease, usually reported in tropical countries. The objective of the present study is to describe the epidemiological and histopathological findings of CLG. Furthermore, use additional tests for demonstration of Mycobacterium sp. in the lesion were performed, e.g. Ziehl-Neelsen staining, immunohistochemical and polymerase chain reaction (PCR) for classification and genetic sequencing of Mycobacterium species. Twenty seven cases of CLG diagnosed between 2005 and 2014 were studied (21 cases by histological examination and six by cytological examination). Boxer dogs were the breed most affected (33.3%) followed by Dachshund dog breed (11.1%). The disease affected dogs with mainly large size (64%) and short-coated (96%). There was no evidence predilection for occurrence in any season. The lesions were localized, in most cases, at the pinna (93%), comprise one or multiple nodules, ulcerated or not. None of the cases was observed with systemic involvement. Histopathological findings included three patterns of nodular to diffuse, with inflammatory infiltration granulomatous/pyogranulomatous that involved superficial and deep dermis. Definitive diagnosis was made by the presence of acid-fast bacilli by Ziehl-Neelsen stain, showing wide variation in the number of bacilli in the lesions, not being statistically correlated to the type of injury or the evolution period. Immunohistochemistry was effective, and in some cases facilitated the identification of bacilli, but in two cases were negative even with marking by Ziehl-Neelsen staining. The immunohistochemistry was positive in 90% cases, and in some cases facilitated the identification of bacilli, but in two cases were negative even with marking by Ziehl-Neelsen staining. The PCR technique was positive in 44% of cases, demonstrating that Mycobacterium murphy was responsible for two cases of GLC and Mycobacterium hodleri by a one case. In other three PCR-positive cases if not got 100% similarity between the sequenced and other Mycobacterium.(AU)

Granuloma leproide canino: estudo de 27 casos / Canine leproid granuloma: study of 27 cases

O granuloma leproide canino (GLC) é uma doença micobacteriana que cursa com lesão nodular, cutânea ou subcutânea, tipicamente auto limitante, decorrente de infecção pelo Mycobacterium. É uma doença dermatológica rara, usualmente relatada em países de clima tropical. O objetivo deste trabalho é caracterizar as alterações microscópicas e epidemiológicas de casos de GLC. Além disso, utilizar exames complementares para demonstração do Mycobacterium sp. na lesão analisada utilizando coloração de Ziehl-Neelsen, imuno-histoquímica e PCR para classificação e sequenciamento da espécie de Mycobacterium. Foram analisados 27 casos de GLC diagnosticados no período compreendido de 2005 a 2014 (21 exames histológicos e seis citológicos). A raça mais acometida foi Boxer (33,3%), seguida da Dachshund (11,1%). Foi frequente o acometimento de caninos de grande porte (64%) e de pelame curto (96%). Não foi possível estabelecer qualquer padrão de sazonalidade do GLC. As lesões se localizaram anatomicamente no pavilhão auricular na maioria dos casos (93%), constituindo-se de nódulos únicos ou múltiplos, ulcerados ou não. Em nenhum dos casos foi observado acometimento sistêmico. Lesões histológicas seguiram três padrões que variaram de nodulares a difusos, com infiltrado granulomatoso/piogranulomatoso com envolvimento de derme superficial e profunda. A observação de bacilos pela coloração de Ziehl-Neelsen confirmou o diagnóstico. Este teste demonstrou grande variação na quantidade de bacilos nas lesões, não relacionado estatisticamente ao tipo da lesão nem ao período evolutivo. A imuno-histoquímica foi positiva em 90% dos casos, e em alguns casos facilitou a identificação de bacilos, entretanto, em dois casos ocorreram resultados negativos mesmo havendo marcação pela coloração de Ziehl-Neelsen. Na técnica de PCR realizada em 18 amostras, 44% dos casos foram positivos, duas sequências inespecíficas, e demonstrou ainda, que Mycobacterium murphy foi responsável por 2 casos e Mycobacterium hodleri em um caso. Em outros três casos não se obteve 100% de semelhança entre o produto sequenciado e os demais Mycobacterium.(AU)

Canine leproid granuloma (CLG) is cutaneous diseases caused by mycobacteria that course with nodular cutaneous or subcutaneous lesion, typically self-limiting, due to Mycobacterium infection. It is an unusual dermatological disease, usually reported in tropical countries. The objective of the present study is to describe the epidemiological and histopathological findings of CLG. Furthermore, use additional tests for demonstration of Mycobacterium sp. in the lesion were performed, e.g. Ziehl-Neelsen staining, immunohistochemical and polymerase chain reaction (PCR) for classification and genetic sequencing of Mycobacterium species. Twenty seven cases of CLG diagnosed between 2005 and 2014 were studied (21 cases by histological examination and six by cytological examination). Boxer dogs were the breed most affected (33.3%) followed by Dachshund dog breed (11.1%). The disease affected dogs with mainly large size (64%) and short-coated (96%). There was no evidence predilection for occurrence in any season. The lesions were localized, in most cases, at the pinna (93%), comprise one or multiple nodules, ulcerated or not. None of the cases was observed with systemic involvement. Histopathological findings included three patterns of nodular to diffuse, with inflammatory infiltration granulomatous/pyogranulomatous that involved superficial and deep dermis. Definitive diagnosis was made by the presence of acid-fast bacilli by Ziehl-Neelsen stain, showing wide variation in the number of bacilli in the lesions, not being statistically correlated to the type of injury or the evolution period. Immunohistochemistry was effective, and in some cases facilitated the identification of bacilli, but in two cases were negative even with marking by Ziehl-Neelsen staining. The immunohistochemistry was positive in 90% cases, and in some cases facilitated the identification of bacilli, but in two cases were negative even with marking by Ziehl-Neelsen staining. The PCR technique was positive in 44% of cases, demonstrating that Mycobacterium murphy was responsible for two cases of GLC and Mycobacterium hodleri by a one case. In other three PCR-positive cases if not got 100% similarity between the sequenced and other Mycobacterium.(AU)

Doenças de bovinos em Mato Grosso diagnosticadas no Laboratório de Patologia Veterinária da UFMT (2005-2014) / Cattle diseases in Mato Grosso diagnosed in the Veterinary Pathology Laboratory of UFMT (2005-2014)

Foi realizado um levantamento nos arquivos do Laboratório de Patologia Veterinária (LPV) da Universidade Federal de Mato Grosso (UFMT) das doenças de bovinos registradas entre os anos 2005 a 2014. Foram revisados 1124 casos. Destes, 27,6% foram amostras obtidas de necropsias realizadas por técnicos do LPV-UFMT e 72,3% foram amostras encaminhadas ao LPV-UFMT por veterinários de campo. Em 49,38% dos casos (555/1124) o diagnóstico da doença foi feito através da análise morfológica de lesões e/ou através de exames complementares. Raiva foi a principal causa de morte de bovinos neste estudo (7,82%). As doenças inflamatórias e parasitárias foram as mais prevalentes sendo diagnosticadas em 27,49% dos casos, seguida das doenças tóxicas e toxiinfecções com 9,78%. As demais categorias foram distribuídas em ordem decrescente em: neoplasmas e lesões tumoriformes (4%), doenças degenerativas (3,02%), distúrbios causados por agentes físicos (2,84%), distúrbios metabólicos e nutricionais (1,42%) e outras categorias (0,71%).(AU)

A survey was conducted on files of the Veterinary Pathology Laboratory (LPV), Federal University of Mato Grosso (UFMT), about cattle disease recorded during the years 2005 to 2014. From a total of 1124 reviewed cases, 27.6% were samples obtained from autopsies performed by technicians of the LPV-UFMT, and 72.3% were samples sent to LPV-UFMT by field veterinarians. In 49.38% of cases (555/1124) the diagnosis of the disease was made by morphological analysis of lesions and/or through additional tests. Rabies was the major cause of death in cattle in this study (7.82%). Inflammatory and parasitic disease was the most prevalent category diagnosed with 27.49% of cases, followed by toxicoses and toxinfections (9.78%). The other categories were distributed in descending order, as neoplasms and tumor-like lesions (4%), degenerative diseases (3.02%), disorders caused by physical agents (2.84%), metabolic and nutritional disorders (1.42%), and other categories (0.71%).(AU)

Doenças de bovinos em Mato Grosso diagnosticadas no Laboratório de Patologia Veterinária da UFMT (2005-2014) / Cattle diseases in Mato Grosso diagnosed in the Veterinary Pathology Laboratory of UFMT (2005-2014)

Foi realizado um levantamento nos arquivos do Laboratório de Patologia Veterinária (LPV) da Universidade Federal de Mato Grosso (UFMT) das doenças de bovinos registradas entre os anos 2005 a 2014. Foram revisados 1124 casos. Destes, 27,6% foram amostras obtidas de necropsias realizadas por técnicos do LPV-UFMT e 72,3% foram amostras encaminhadas ao LPV-UFMT por veterinários de campo. Em 49,38% dos casos (555/1124) o diagnóstico da doença foi feito através da análise morfológica de lesões e/ou através de exames complementares. Raiva foi a principal causa de morte de bovinos neste estudo (7,82%). As doenças inflamatórias e parasitárias foram as mais prevalentes sendo diagnosticadas em 27,49% dos casos, seguida das doenças tóxicas e toxiinfecções com 9,78%. As demais categorias foram distribuídas em ordem decrescente em: neoplasmas e lesões tumoriformes (4%), doenças degenerativas (3,02%), distúrbios causados por agentes físicos (2,84%), distúrbios metabólicos e nutricionais (1,42%) e outras categorias (0,71%).(AU)

A survey was conducted on files of the Veterinary Pathology Laboratory (LPV), Federal University of Mato Grosso (UFMT), about cattle disease recorded during the years 2005 to 2014. From a total of 1124 reviewed cases, 27.6% were samples obtained from autopsies performed by technicians of the LPV-UFMT, and 72.3% were samples sent to LPV-UFMT by field veterinarians. In 49.38% of cases (555/1124) the diagnosis of the disease was made by morphological analysis of lesions and/or through additional tests. Rabies was the major cause of death in cattle in this study (7.82%). Inflammatory and parasitic disease was the most prevalent category diagnosed with 27.49% of cases, followed by toxicoses and toxinfections (9.78%). The other categories were distributed in descending order, as neoplasms and tumor-like lesions (4%), degenerative diseases (3.02%), disorders caused by physical agents (2.84%), metabolic and nutritional disorders (1.42%), and other categories (0.71%).(AU)

Presence of Ureaplasma diversum in the genital tracts of female dairy cattle in Mato Grosso State, Brazil.

Ureaplasma diversum infection in bovine females may result in various reproductive problems, including granular vulvovaginitis, abortion, weak calves, salpingitis, and spontaneous abortion. The presence of U. diversum in a dairy bovine population from midwestern Brazil has not been established. The aim of this study was to determine whether U. diversum was present in dairy cattle from midwestern Brazil using polymerase chain reaction (PCR). Vulvovaginal mucus was analyzed from 203 cows located in six municipalities in the north region of Mato Grosso State, Brazil. A total of 25% of dairy cows with vulvovaginitis were positive for U. diversum. The factors evaluated were included in a multivariable logistic regression model with the presence of at least one positive cow in the herd serving as the dependent variable. Three variables were significantly associated with a U. diversum-positive PCR and were included in the final multivariable model: number of parities, vulvar lesions, and reproductive problems. For each new parity, the chance of U. diversum infection decreased 0.03-fold, indicating that cows with the highest number of parities were more protected. The presence of vulvar lesions was increased 17.6-fold in females positive for U. diversum, suggesting that this bacterium could be related to the red granular lesions in the vulvar mucosa, whereas reproductive problems were increased 7.6-fold. However, further investigations should be conducted to ascertain the effects of U. diversum in association with other mycoplasma species in the herds studied.

Retrospective canine skin peripheral nerve sheath tumors data with emphasis on histologic, immunohistochemical and prognostic factors / Dados retrospectivos de tumores de bainha de nervo periférico na pele de cães com ênfase a fatores histológicos, imuno-histoquímicos e prognósticos

In this retrospective study was determined the frequency of canine skin peripheral nerve sheath tumors (PNST) in cases diagnosed by the Setor de Patologia Veterinária of the Universidade Federal do Rio Grande do Sul (SPV-UFRGS), Brazil, between the years 2000 and 2012. The canine profiles, as well as histological, immunohistochemical and prognostic aspects of the tumors were based on 70 samples, comprising 40 females, 29 males and one unspecified sample. Between 2000 and 2012, 2,984 skin tumors of dogs were diagnosed in the SPV-UFRGS, totaling 2.34% of skin neoplasms in dogs. Animals that comprised the largest amount of samples (43%) were those with no breed (SRD), followed by German Shepherds (10%). Females were more affected than males (40/70 - 57% and 29/70 - 41% respectively). Skin PNST of this research showed predominant localization on the limbs (40% in the forelimbs and 29% in the hindlimbs); affecting adult dogs, mostly aged between 8 and 11 years (54%). The samples were routinely processed for hematoxylin and eosin, and were also evaluated by toluidine blue and Masson's trichrome staining, and immunohistochemistry (IHC) anti-vimentin, -S-100, -GFAP, -actin, von Willebrand factor and neurofilament. Anisocytosis and anisokaryosis, mitotic index, intratumoral necrosis, invasion of adjacent tissues, tumor location, local recurrence and metastasis were related to the diagnosis of benign (49/70) or malignant tumor (21/70). The Antoni A histological pattern was observed more frequently in benign tumors. The immunohistochemistry helped to diagnose PNST, and anti-vimentin and anti-protein S-100 showed the highest rates of immunostaining. Throughout statistical analysis of animals with tumor recurrence, it was found that the chance of an animal with a malignant peripheral nerve sheath tumor to develop recurrence is 4.61 times higher than in an animal that had a benign tumor.(AU)

Neste estudo retrospectivo foi determinada a frequência dos tumores de bainha de nervo periférico (TBNP) na pele de cães diagnosticados pelo Setor de Patologia Veterinária da Universidade Federal do Rio Grande do Sul (SPV-UFRGS), Brasil, no período de 2000 a 2012. O histórico dos cães, assim como a histologia, a imuno-histoquímica e o prognóstico em relação aos tumores foram baseados em 70 amostras histológicas, correspondendo a 40 fêmeas (57%), 29 machos (41%) e uma amostra sem a informação do sexo. De 2000 a 2012, foram diagnosticados 2984 tumores de pele de cães pelo SPV-UFRGS, totalizando 2,34% das neoplasias em cães. A maior parte das amostras (43%) foi proveniente de animais sem raça definida (SRD), seguidos pelos da raça Pastor Alemão (10%). A localização predominante dos TBNP desta pesquisa ocorreu em membros (40% em membro tóracico e 29% em membro pélvico), afetando principalmente cães de oito a 11 anos idade (54%). As amostras foram processadas rotineiramente para coloração de Hematoxilina e eosina, e foram realizadas as colorações de azul de toluidina e tricrômio de Masson, assim como realizada imuno-histoquímica (IHQ) anti-vimentina, -S-100, -GFAP, -actina, von Willbrand e neurofilamento. Os fatores anisocitose e anisocariose, índice mitótico, necrose intratumoral, invasão tumoral em tecidos adjacentes, localização tumoral, local de recorrência e metástase foram relacionados com o diagnóstico de benignidade (49/70) ou malignidade (21/70). O padrão histológico de Antoni A foi observado com mais frequência em tumores benignos. A IHQ auxiliou no diagnóstico dos TBNP, com maiores índices de imunomarcação anti-vimentina e S-100. A análise estatística das amostras de animais que apresentaram recidiva tumoral evidenciou que a chance de um animal com tumor de bainha de nervo periférico maligno desenvolver recidiva é 4,61 vezes maior do que em animais que apresentam tumor benigno.(AU)

Retrospective canine skin peripheral nerve sheath tumors data with emphasis on histologic, immunohistochemical and prognostic factors / Dados retrospectivos de tumores de bainha de nervo periférico na pele de cães com ênfase a fatores histológicos, imuno-histoquímicos e prognósticos

In this retrospective study was determined the frequency of canine skin peripheral nerve sheath tumors (PNST) in cases diagnosed by the Setor de Patologia Veterinária of the Universidade Federal do Rio Grande do Sul (SPV-UFRGS), Brazil, between the years 2000 and 2012. The canine profiles, as well as histological, immunohistochemical and prognostic aspects of the tumors were based on 70 samples, comprising 40 females, 29 males and one unspecified sample. Between 2000 and 2012, 2,984 skin tumors of dogs were diagnosed in the SPV-UFRGS, totaling 2.34% of skin neoplasms in dogs. Animals that comprised the largest amount of samples (43%) were those with no breed (SRD), followed by German Shepherds (10%). Females were more affected than males (40/70 - 57% and 29/70 - 41% respectively). Skin PNST of this research showed predominant localization on the limbs (40% in the forelimbs and 29% in the hindlimbs); affecting adult dogs, mostly aged between 8 and 11 years (54%). The samples were routinely processed for hematoxylin and eosin, and were also evaluated by toluidine blue and Masson's trichrome staining, and immunohistochemistry (IHC) anti-vimentin, -S-100, -GFAP, -actin, von Willebrand factor and neurofilament. Anisocytosis and anisokaryosis, mitotic index, intratumoral necrosis, invasion of adjacent tissues, tumor location, local recurrence and metastasis were related to the diagnosis of benign (49/70) or malignant tumor (21/70). The Antoni A histological pattern was observed more frequently in benign tumors. The immunohistochemistry helped to diagnose PNST, and anti-vimentin and anti-protein S-100 showed the highest rates of immunostaining. Throughout statistical analysis of animals with tumor recurrence, it was found that the chance of an animal with a malignant peripheral nerve sheath tumor to develop recurrence is 4.61 times higher than in an animal that had a benign tumor...

Neste estudo retrospectivo foi determinada a frequência dos tumores de bainha de nervo periférico (TBNP) na pele de cães diagnosticados pelo Setor de Patologia Veterinária da Universidade Federal do Rio Grande do Sul (SPV-UFRGS), Brasil, no período de 2000 a 2012. O histórico dos cães, assim como a histologia, a imuno-histoquímica e o prognóstico em relação aos tumores foram baseados em 70 amostras histológicas, correspondendo a 40 fêmeas (57%), 29 machos (41%) e uma amostra sem a informação do sexo. De 2000 a 2012, foram diagnosticados 2984 tumores de pele de cães pelo SPV-UFRGS, totalizando 2,34% das neoplasias em cães. A maior parte das amostras (43%) foi proveniente de animais sem raça definida (SRD), seguidos pelos da raça Pastor Alemão (10%). A localização predominante dos TBNP desta pesquisa ocorreu em membros (40% em membro tóracico e 29% em membro pélvico), afetando principalmente cães de oito a 11 anos idade (54%). As amostras foram processadas rotineiramente para coloração de Hematoxilina e eosina, e foram realizadas as colorações de azul de toluidina e tricrômio de Masson, assim como realizada imuno-histoquímica (IHQ) anti-vimentina, -S-100, -GFAP, -actina, von Willbrand e neurofilamento. Os fatores anisocitose e anisocariose, índice mitótico, necrose intratumoral, invasão tumoral em tecidos adjacentes, localização tumoral, local de recorrência e metástase foram relacionados com o diagnóstico de benignidade (49/70) ou malignidade (21/70). O padrão histológico de Antoni A foi observado com mais frequência em tumores benignos. A IHQ auxiliou no diagnóstico dos TBNP, com maiores índices de imunomarcação anti-vimentina e S-100. A análise estatística das amostras de animais que apresentaram recidiva tumoral evidenciou que a chance de um animal com tumor de bainha de nervo periférico maligno desenvolver recidiva é 4,61 vezes maior do que em animais que apresentam tumor benigno...