Clinical and pathological features and differential diagnosis of fibro-osseous tumors and dysplasias / 中华口腔医学杂志

Fibro-osseous lesions is a class of diseases with obvious similarities in clinical manifestations and pathological features, which has been attracting the attention of clinicians and pathologists. The latest WHO 2022 Classification (5th edition) included six of these diseases (cemento-osseous dysplasia, segmental odontomaxillary dysplasia, fibrous dysplasia, juvenile trabecular ossifying fibroma, psammomatoid ossifying fibroma and familial gigantiform cementoma) in the " fibro-osseous tumours and dysplasias ", and put forward new ideas on the diagnosis and treatment of these diseases. According to the latest WHO 2022 Classification (5th edition), the clinical and pathological features, diagnosis and differential diagnosis of these six diseases were described.

O Cripto-1 é um potencial biomarcador para o diagnóstico diferencial dos tumores ósseos benignos e malignos dos maxilares / Cripto-1 is a potential biomarker for the differential diagnosis of benign and malignant jaw bone tumors

O termo lesão fibro-óssea dos maxilares (LFOM) é uma designação inespecífica para um grupo de distúrbios caracterizados, morfologicamente, pela substituição do tecido ósseo por uma matriz de tecido conjuntivo fibrosa, a qual exibe neoformação de tecido ósseo com diferentes graus de mineralização. O diagnóstico preciso das LFOM não é fácil e só pode ser realizado após uma análise minuciosa dos aspectos clínicos, radiológicos e histológicos. No entanto, deve-se admitir que alguns casos desafiam a exatidão na emissão do diagnóstico. Considerando a diversidade do comportamento biológico das lesões e as pesquisas sobre a identificação de potenciais marcadores moleculares, o objetivo deste trabalho foi realizar uma análise imunohistoquímica do cripto-1 (CR-1) e da ß-catenina em uma série de casos diagnosticados microscopicamente como displasia fibrosa (DF) (n=30), fibroma ossificante central (FOC) (n=28) e osteossarcoma (OS) (n=5) armazenados nos arquivos do Serviço de Anatomia Patológica Oral de uma população brasileira. As expressões imuno-histoquímicas foram analisadas através de escore imunorreativo. Os dados obtidos foram inseridos em um arquivo do software Microsoft Excel® e, posteriormente, analisados no software Statistical Package for Social Science. Para todos os testes estatísticos utilizados, o nível de significância foi estabelecido em 5% (p<0,05). O CR-1 exibiu predominância de um padrão fortemente positivo para os casos de FOC e OS, e do padrão moderado para os casos de DF (p<0,001). A ß-catenina exibiu predominância do padrão negativo para os casos de FOC e DF, e do padrão fortemente positivo para os casos de OS (p=0,001). O teste de correlação de Spearman revelou correlação positiva entre os escores imunorreativos de CR-1 e ß-catenina. Os resultados desta pesquisa sugerem a participação do CR-1 na patogênese do FOC e OS, assim como o uso dessa proteína como potencial biomarcador molecular para o diagnóstico diferencial de LFOM (AU).

Fibro-osseous lesions of maxilar (FOLM) is a non-specific designation for a group of disorders characterized, morphologically, by replacement of bone tissue by a matrix of fibrous connective tissue, showing neoformation of bone tissue with varying degrees of mineralization. Precise diagnosis of FOLM is not easy, and requires careful analyisis of clinical, radiological and histological aspects. Even so, some cases still challenge accuracy in diagnosis. Considering the diversity of biological behaviour of the lesions and the research regarding identification of potential molecular markers, this study aims to perform immunohistochemical analysis of crypto-1 and ß-catenin in a series of cases diagnosed microscopically as fibrous dysplasia (FD) (n=30), central ossifying fibroma (COF) (n=28) and osteossarcoma (OS) (n=5), stored in archives of Oral Pathological Anatomy Service of a Brazilian population. Immunohistochemical expressions were analysed by imunorreactive score. All data obtained was inserted into a file of Microsoft Excel® software (Microsoft Corporation, USA) and then transferred to a database of SPSS® for Windows software (Statistical Package for Social Sciences; IBM, USA), version 20.0. For all statistical tests used, the significance level established was p ≤ 0.05. CR-1 showed a predominant pattern of strong positive in COF and OS cases, and a moderate positive in FD cases (p<0,001). ß-catenin showed a predominant negative pattern for COF and FD cases, and a predominant strong positive pattern for OS cases (p=0,001). Spearman correlation tests showed positive correlation of the imunoreative scores of CR-1 and ß-catenin. Those results suggests CR-1 could be involved in the pathogenesis of COF and OS, and this protein could be used as a potential molecular biomarker for diferential diagnosis of FOLM (AU).

Incidence of reactive hyperplastic lesions in the oral cavity: a 10 year retrospective study in Santa Catarina, Brazil / Incidência de lesões hiperplásicas reativas na cavidade bucal: estudo retrospectivo de 10 anos em Santa Catarina, Brasil

Abstract Introduction Reactive hyperplastic lesions develop in response to a chronic injury simulating an exuberant tissue repair response. They represent some of the most common oral lesions including inflammatory fibrous hyperplasia, oral pyogenic granuloma, giant cell fibroma, peripheral ossifying fibroma, and peripheral giant cell lesions. Objective The incidence of those lesions was investigated in an oral pathology service, and the clinical characteristics, associated etiological factors, concordance between the clinical and histopathological diagnostic was determined. Methods A total of 2400 patient records were screened from 2006 to 2016. Clinical features were recorded from biopsy reports and patients' files. Results A total of 534 cases of reactive hyperplastic lesions were retrieved and retrospectively studied, representing 22.25% of all diagnoses. The most frequent lesion was inflammatory fibrous hyperplasia (72.09%), followed by oral pyogenic granuloma (11.79%), giant cell fibroma (7.30%), peripheral ossifying fibroma (5.24%), and peripheral giant cell lesions (3.55%). Females were predominantly affected (74.19%), the gingiva and alveolar ridge were the predominant anatomical site (32.89%), and chronic traumatism was presented as the main etiological factor. The age widely ranges from the 1st decade of life to the 7th. Clinically, the reactive hyperplastic lesions consisted of small lesions (0.5-2 cm) and shared a strong likeness in color to the oral mucosa. The concordance between the clinical and histopathological diagnostic was high (82.5%). Conclusion Reactive hyperplastic lesions had a high incidence among oral pathologies. The understanding of their clinical features helps to achieve a clearer clinical and etiological diagnosis, and the knowledge of factors related to their development. This may contribute to adequate treatment and positive prognosis.

Resumo Introdução As lesões hiperplásicas reativas se desenvolvem em resposta a uma lesão crônica que estimula uma resposta acentuada de reparo tecidual. Elas representam uma das lesões orais mais comuns, inclusive hiperplasia fibrosa inflamatória, granuloma piogênico oral, fibroma de células gigantes, fibroma periférico ossificante e lesão periférica de células gigantes. Objetivo A incidência dessas lesões foi investigada em um serviço de patologia bucal e as características clínicas, os fatores etiológicos associados e a concordância entre os diagnósticos clínico e histopatológico foram determinados. Método Foram selecionados 2.400 registros de pacientes entre 2006 e 2016. As características clínicas foram registradas a partir de laudos de biópsia e dos prontuários dos pacientes. Resultados Um total de 534 casos de lesões hiperplásicas reativas foram recuperados e retrospectivamente estudados, representando 22,25% de todos os diagnósticos. A lesão mais frequente foi hiperplasia fibrosa inflamatória (72,09%), seguida por granuloma piogênico oral (11,79%), fibroma de células gigantes, (7,30%), fibroma periférico ossificante (5,24%) e lesão periférica de células gigantes (3,55%). O sexo feminino foi predominante (74,19%), a gengiva e a crista alveolar foram o local anatômico predominante (32,89%) e o traumatismo crônico foi demonstrado como o principal fator etiológico. A idade variou desde a 1ª década de vida até a 7ª. Clinicamente, as LHR consistiram em pequenas lesões (0,5 a 2 cm) que apresentaram uma forte semelhança de cor com a mucosa oral. A concordância entre o diagnóstico clínico e histopatológico foi alta (82,5%). Conclusão As lesões hiperplásicas reativas apresentaram alta incidência entre as patologias bucais. A compreensão das características clínicas ajuda na realização de um diagnóstico clínico e etiológico mais claro, bem como determinar os fatores relacionados ao seu desenvolvimento. Dessa forma contribui para um tratamento adequado e um prognóstico positivo.

Fibroma ossificante periférico ­ Relato longitudinal de dois casos clínicos / Long-term follow-up of peripheral ossifying fibroma ­ report of two cases

O fibroma ossificante periférico é uma lesão não neoplásica proliferativa, não patognomônico, de evolução lenta e indolor, que acomete os tecidos gengivais. O presente trabalho teve como objetivo relatar dois casos clínicos desta lesão em um acompanhamento em longo prazo, ressaltando os aspectos clínicos e histopatológicos, bem como seu tratamento e prognóstico.

The peripheral ossifying fibroma is a non-neoplasic, proliferative lesion of painless and slow evolutive character, which involves the gingival tissues. This paper reports on two clinical cases in a long-term follow-up highlightening their clinical and histopathologic aspects, treatment, and outcomes.

The role of Osterix protein in the pathogenesis of peripheral ossifying fibroma

Abstract Peripheral ossifying fibroma (POF) is a reactive lesion of oral tissues, associated with local factors such as trauma or presence of dental biofilm. POF treatment consists of curettage of the lesion combined with root scaling of adjacent teeth and/or removal of other sources of irritants. This study aimed to analyze the clinical and pathological features of POF and to investigate the immunoexpression of Osterix and STRO-1 proteins. Data such as age, gender, and size were obtained from 30 cases of POF. Microscopic features were assessed by conventional light microscopy using hematoxylin-eosin staining and immunohistochemical markers, and by polarized light microscopy using Picrosirius red staining. The age range was 11-70 years and 70% of the patients were female. Moreover, the size of POF varied from 0.2 to 5.0 cm; in 43.33% of the cases, the mineralized content consisted exclusively of bony trabeculae. The immunohistochemical analysis showed nuclear staining for Osterix in 63% and for STRO-1 in 20% of the cases. Mature collagen fibers were observed in mineralized tissue in 76.67% of the cases. The clinical and microscopic features observed were in agreement with those described in the literature. Osterix was overexpressed, while STRO-1 was poorly expressed. Osterix was expressed particularly in cells entrapped in and around mineralized tissue, indicating the presence of a stimulus that triggers the differentiation of these cells into osteoblasts or cementoblasts, i.e., cells that produce mineralized tissue. Based on our results, Osterix may play a role in the pathogenesis of POF.

Peripheral Ossifying Fibroma: A Case Report & Review of Literature.

Gingival enlargements are commonly seen especially localized. Most of these enlargements are non-neoplastic and rather reactive by nature. On clinical examination, it is not always possible to differentiate one specific gingival enlargement from other. Clinically, differentiating one from the other as a specific entity is often not possible. To identify these lesions, histopathological examination is required. One of such seen entities is peripheral ossifying fibroma (POF) that is diagnosed by histopathological examination. Peripheral ossifying is a reactive benign lesion. A clinical report of 23 years old male with POF maxillary left canine and premolar region is reported with treatment and 1-year follow-up.

Fibroma osificante: presentación de un caso clínico en mandíbula y revisión de la literatura / Ossifying fibroma: presentation of a clinical case in the jaw and review of the literature

El fibroma osificante es un tumor benigno casi idéntico al fibroma cementificante. Se inscribe dentro de las llamadas lesiones fibroóseas, como la displasia fibrosa y la displasia cemento-osificante, que se caracterizan por el reemplazo de la arquitectura ósea normal por fibroblastos, tejido fibroso y cantidades variables de tejido mineralizado. Debido a sus características clínicas, radiológicas e histológicas, la clasificación de estas lesiones ha sido muy controversial. Presentamos un caso clínico en mandíbula, detalladno su diagnóstico y tratamiento y una revisión de la literatura...

Lesión híbrida conformada por una lesión central de células gigantes y un fibroma osificante central: reporte de un caso y revisión de la literatura / Hybrid lesión composes by a central giant cell lesion and central ossifying fibroma: a case report and review of literature

Las lesiones híbridas son entidades poco frecuentes conformadas por elementos histopatológicos de distintas lesiones, la asociación de un Fibroma Osificante Central (FOC) con una Lesión Central de Células Gigantes (LCCG) es un ejemplo de ellas y representa el tipo más frecuentemente reportado en la literatura con diez casos hasta la fecha. A continuación presentamos el caso de una paciente de 24 años de edad, quien es referida al servicio de clínica estomatológica de la Facultad de Odontología, por presentar un aumento de volumen en la zona mandibular derecha que ocasiona asimetría facial, al examen intrabucal se observó una lesión tumoral de aproximadamente 2,5 cms. de diámetro y recubierta por mucosa bucal sana, que se extendía desde el canino inferior derecho hasta el segundo premolar del mismo lado (de 43 al 45). La paciente refiere una evolución de 3 meses y aparición posterior a un trauma. Se indican pruebas hematológicas y de vitalidad pulpar de los dientes involucrados, tomografía computarizada y biopsia Incisional, la cual concluye: LCCG asociada a FOC. Se trata con recesión quirúrgica total previo tratamiento endodóntico de los dientes involucrados y después de dos años la paciente se mantiene libre de recidiva. El reporte de este tipo de lesiones híbridas permitirá entender mejor en el futuro su comportamiento y a su vez brindar el tratamiento más adecuado a estos pacientes.

Hybrid lesions are rare entities formed by histopathological elements of different lesions, the association of a Central Ossifying Fibroma (COF) with a Central Giant Cell Lesion (CGCL) is an example of them and represents the most frequently reported type in the literature, only ten cases to date. We present the case of a 24 years female patient, who is referred to the dental clinic service to present a swelling in the right mandibular region causing facial asymmetry, the intra oral examination revealed a 2,5 cm lesion covered with healthy oral mucosa which extended from the distal aspect of lower right canine to the right second bicuspid, with 3 months evolution and associated to a trauma. Haematological tests, pulp vitality of involved teeth, CT scan and incisional biopsy were indicated, concluding a diagnosis of COF associated to CGCL. The decision was made to go for the surgical approach of the lesion with previous endodontic treatment of involved teeth and after two years the patient remains free of recurrence. The report of this type of hybrid lesions helps to understand their behavior and guides to the best treatment for these patients.

Ossifying Fibroma of the Jaws: A Clinicopathological Case Series Study

The aim of this study was to assess the clinical, radiographic and microscopic features of a case series of ossifying fibroma (OF) of the jaws. For the study, all cases with OF diagnosis from the files of the Oral Pathology Laboratory, University of Ribeirão Preto, Ribeirão Preto, SP, Brazil, were reviewed. Clinical data were obtained from the patient files and the radiographic features were evaluated in each case. All cases were reviewed microscopically to confirm the diagnosis. Eight cases were identified, 5 in females and 3 in males. The mean age of the patients was 33.7 years and most lesions (7 cases) occurred in the mandible. Radiographically, all lesions appeared as unilocular images and most of them (5 cases) were of mixed type. The mean size of the tumor was 3.1 cm and 3 cases caused displacement of the involved teeth. Microscopically, all cases showed several bone-like mineralized areas, immersed in the cellular connective tissue. From the 8 cases, 5 underwent surgical excision and 1 patient refused treatment. In the remaining 2 cases, this information was not available. In conclusion, OF occurs more commonly in women in the fourth decade of life, frequently as a mixed radiographic image in the mandible. Coherent differential diagnoses are important to guide the most adequate clinical approach. A correlation between clinical, imaginological and histopathological features is the key to establish the correct diagnosis.

O objetivo deste estudo foi analisar as características clínico-radiográficas e microscópicas de uma série de casos de fibroma ossificante (FO). Para o estudo, todos os casos com diagnóstico de FO do arquivo do Laboratório de Patologia Bucal da Universidade de Ribeirão Preto, Ribeirão Preto, São Paulo, Brasil, foram estudados. Os dados clínicos foram coletados das fichas de encaminhamento das lesões ao Laboratório. As características radiográficas foram avaliadas em cada caso. Todos os casos foram revisados microscopicamente para confirmação do diagnóstico. Oito casos foram identificados, 5 em mulheres e 3 em homens. A idade média dos pacientes foi de 33,7 anos e a maioria das lesões (7 casos) ocorreu na mandíbula. Radiograficamente todas as lesões se apresentavam como imagens uniloculares e a maioria (5 casos) se mostravam como imagem mista. O tamanho médio do tumor foi de 3,1 cm e 3 casos causavam deslocamento dos dentes envolvidos. Microscopicamente, todos os casos apresentavam várias áreas mineralizadas semelhantes a osso, imersas em um tecido conjuntivo celularizado. Dos 8 casos, 5 foram submetidos a excisão cirúrgica da lesão e 1 paciente recusou tratamento. Nos outros 2 casos, essa informação não estava disponível. Conclui-se que o FOs ocorrem mais comumente na mandíbula de pacientes do gênero feminino durante a quarta década de vida e se apresentam frequentemente como uma imagem radiográfica mista. Diagnósticos diferenciais coerentes são importantes para guiar a conduta clínica mais adequada. A correlação entre as características clínicas, imaginológicas e histopatológicas é a chave para estabelecer o diagnóstico correto.

Cellular proliferation markers in peripheral and central fibromas: a comparative study

ABSTRACT Objective: To perform a comparative study of the cellular proliferation in the peripheral and central fibromas. Material and Methods: Immunohistochemistry for PCNA and the AgNOR technique were performed in 9 cases of peripheral odontogenic fibroma (POF), in 4 cases of odontogenic fibroma (OdF), in 8 cases of peripheral ossifying fibroma (PEOF) and 7 cases of ossifying fibroma (OsF). The Kruskal-Wallis and Mann-Whitney tests were used for the statistical analyses. Results: Mesenchymal component of the central lesions presented a higher mean number of AgNOR per nucleus and PCNA index than did the peripheral lesions (P≤0.05). The mean number of AgNOR per nucleus in the epithelial component proved to be higher in the OdF than in the POF (P≤0.05). The mesenchymal and epithelial components presented similar mean numbers of AgNOR per nucleus and PCNA index in the OdF, as well as a similar mean number of AgNOR per nucleus in the POF. Conclusions: The mesenchymal component may well play a role in the differences between the biological behaviour of the central lesions as compared to the peripheral lesions. Moreover, considering that the epithelial and mesenchymal components in odontogenic fibromas presented a similar proliferation index, more research is warranted to understand the true role of the epithelial components, which are believed to be inactive in nature, as well as in the development and biological behaviour of these lesions. .

Fibroma cemento-osificante mandibular: presentación de un caso y revisión de la literatura / Mandibular cemento-ossifying fibroma: case report and review of the literature

Objetivo: presentar una patología tumoral odontogénica de baja frecuencia y complejo diagnóstico diferencial. Caso clínico: el fibroma cemento-osificante es considerado un raro e infrecuente proceso neoplásico benigno, cuyos elementos originarios se encuentran en el ligamento periodontal. Se conoce generalmente también como fibroma osificante (World Health Organization Classification of Tumors - WHO Classification, 2005), con dos variantes histológicas: el fibroma cemento-osificante trabecular juvenil (JTOF) y el fibroma cemento-osificante juvenil psamomatoide (JPOF). La clínica y los estudios radiológicos pueden ayudar a su diferenciación, demarcación y/o encapsulación del fibroma. Conclusiones: es el estudio anatomo-patológico el determinante de la conducta a seguir. El fibroma cemento-osificante radiográficamente podría conofundirse con otros tipos de lesiones, pero éste en particular posee un comportamiento benigno.

Concomitant occurrence of cemento-ossifying fibroma and adenomatoid odontogenic tumor with bilateral impacted permanent canines in the mandible.

Adenomatoid odontogenic tumor (AOT) is an uncommon, benign and slow growing odontogenic tumor, which is usually located in an anterior region of the maxilla without pain. Cemento-ossifying fibroma (COF) is a relatively rare benign tumor of the jaw. Here we present 2 lesions presenting in unusual forms, follicular variant of AOT in the mandible and COF associated with impacted canine in the mandible, occurring concomitantly in the same patient. Both lesions presented classic histopathologic features.

Análise molecular dos genes HRPT2 e ciclina D1 na displasia fibrosa, no fibroma ossificante e no osteossarcoma dos maxilares / HRPT2 and Cyclin D1 molecular investigation in fibrous dysplasia, ossifying fibroma and osteosarcoma of the jaws

A displasia fibrosa (DF), o fibroma ossificante (FO) e o osteossarcoma (OS) são considerados lesões ósseo-relacionadas, que possuem uma patogênese incerta. O gene HRPT2 codifica uma proteína de 531 aminoácidos denominada parafibromina. Recentemente, foram descritas mutações no gene supressor de tumor HRPT2 em FO. Neste estudo, pela primeira vez, foi levantada a hipótese se estas alterações também não poderiam participar da patogênese da DF e do OS, além fod FO. Em amostras de lesões ósseo-relacionadas, foram investigadas alterações no gene HRPT2/parafibromina em nével de DNA ( por meio de análise da perda de heterozigosidade - LOH), do trancrito mRNA (por meio do RT-PCR, do sequenciamentodireto e PCR quantitativo em tempo real) e da proteína (por meio de imunoistoquímica)...

Fibroma cemento osificante: análisis clínico, radiológico e histológico de 2 casos en una misma familia / Cemento-ossifying fibroma: clinical, radiological and histological analysis of 2 cases in one family

El Fibroma Cemento Osificante (FCO) es una lesión pseudo tumoral benigna de origen odontogénico, que se ubica preferentemente a nivel de molares y premolares mandibulares. Nuestro objetivo es presentar casos de FCO dentro de una misma familia, describiendo las características clínicas, radiográficas, histológicas, tratamiento y seguimiento de cada uno de ellos. Dos pacientes hermanos con FCO mandibulares atendidos en el Hospital de Carabineros fueron incluidos en este estudio. La evolución completa de cada caso es expuesta, resaltando el componente familiar de esta patología poco prevalente. Todos los pacientes fueron tratados con remoción completa de la lesión y relleno del defecto óseo con injerto autólogo de cresta iliaca o con injerto óseo particulado sintético (ChronOS®). Un paciente presento recidiva de la lesión y posteriormente un nuevo FCO en el lado contra lateral. En este tipo de lesiones, es muy importante valerse de todas las herramientas diagnosticas que estén a nuestro alcance, ya que la baja ocurrencia de estas lesiones, junto con la gran similitud tanto clínica, radiográfica e histológica que presenta con otras entidades patológicas de los maxilares, hacen que un estudio superficial, puedan llevar a un diagnostico y tratamiento erróneo, afectando la calidad de vida del paciente. El tratamiento de estas lesiones es conservador, y las recidivas son raras.

The Cemento-ossifying fibroma (COF) is a benign fibro-osseous neoplasm of odontogenic origin, that is preferentially localized in the molar and premolar mandibular area. Our goal is to present cases of COF that occurred within the same family, describing clinical, radiological and histological characteristics, in addition to treatment and monitoring of each case. Two patients who are brothers, treated at the Hospital de Carabineros, who had mandibular COF, were included in this study. The complete evolution of each case is presented, highlighting the family component of this uncommon disease. All patients were treated with complete removal of the lesion and filling the bone defect with autologous iliac crest graft or synthetic particulated bone graft (ChronOS®). One patient had recurrence of the injury and then presented a new COF on the contralateral side. In this type of injury it is very important to use all the diagnostic tools within our reach. The rarity of these lesions, and the great similarity of both clinical, radiological and histological features with other pathological conditions of the jaws, and a poorly conducted study can lead to wrong diagnosis and treatment affecting the quality of life of patients. The treatment of these lesions is conservative, and relapses are rare.

Peripheral ossifying fibroma: a clinical report / Fibroma osificante periférico: un reporte clínico

Localized growths are commonly seen on the gingiva. Many of these enlargements are considered to be reactive rather than neoplastic in nature. Clinically differentiating one from the other as a specific entity is often not possible. Histopathologic examination is needed in order to positively identify the lesion. The peripheral ossifying fibroma is one such lesion. We report in this study, the clinical report of a 20-yr-old male patient with a peripheral ossifying fibroma in the maxilla exhibiting significant size with the disease duration of 1 year. The signs of recurrence in spite of thorough excision and debridement exposed the need for further study of the causes of recurrence and possible modes to avoid the situation. Clinical, radiographical and histological characteristics are discussed and recommendations regarding treatment and follow-up are provided.

Aumentos de volumen localizados se observan con frecuencia en la encía. Muchos de estos crecimientos se consideran de tipo reaccional más que de naturaleza neoplásica. Clínicamente diferenciar uno del otro como una entidad específica no siempre es posible. El examen histopatológico es necesario con el fin de identificar positivamente a la lesión. El fibroma osificante periférico es una de estas lesiones. Se presenta en este estudio, el informe clínico de un paciente de sexo masculino de 20 años de edad con un fibroma osificante periférico en el maxilar de un tamaño significativo con 1 año de duración de la lesión. Los signos de recurrencia a pesar de la escisión completa y desbridamiento expusieron la necesidad de estudiar más a fondo las causas de la recurrencia y los posibles modos de evitar la situación. Las características clínicas, radiográficas e histológicas son discutidas junto a recomendaciones sobre el tratamiento y seguimiento.

Mineralized components and their interpretation in the histogenesis of peripheral ossifying fibroma.

Background: Peripheral ossifying fibroma (POF) is a lesion of gingival tissue that predominantly affects women and is usually located in maxilla, anterior to molars. The definitive diagnosis is established by histopathological examination, which reveals the presence of cellular connective tissue with focal calcifications. Objective: This study hypothesizes the histogenesis of POF by analyzing the diverse spectrum of mineralized components with a polarizing microscope. Materials and Methods: A retrospective study was undertaken which involved a detailed review of clinical, radiographic and histopathological features of 22 cases of POF, retrieved from departmental archives. These cases were subsequently stained with a histochemical stain (van Gieson) and observed under a polarizing microscope. Results: The study revealed that the most common age of occurrence was in second and third decades with a strong female predilection (73%), Interdental papilla of the maxillary anterior region was the most commonly afflicted site. About 90% cases showed no radiographic features.Histopathological examination showed that 73% cases consisted of a fibrocellular connective tissue stroma surrounding the mineralized masses. 50% mineralized masses comprised of woven bone, 18% showed combination of lamellar bone and cellular cementum, 18% showed only cementum (cellular and acellular), and remaining 13.6% exhibited a mixture of woven and lamellar bone under polarizing microscope. Conclusion: The study supports the theory that POF develops from cells of periodontal ligament (PDL)/periosteum as undifferentiated mesenchymal cells having an inherent proliferative potential to form bone or cementum, whose nature can be confirmed by polarizing microscope.

En bloc resection of huge cemento-ossifying fibroma of mandible: avoiding lower lip split incision

Cemento-ossifying Fibroma [COF] is an osteogenic benign neoplasm affecting the jaws and other craniofacial bones. It commonly presents as a progressively slow growing pathology, which can sometimes attain an enormous size, causing facial deformity. A case of a huge cemento-ossifying fibroma, appearing as a mandibular dumbbell tumour in a male patient is documented, which caused massive bone destruction and deformity. It was surgically removed by performing en bloc resection of mandible avoiding the splitting of lower lip incision technique, thereby maintaining his normal facial appearance

Fibroma periférico osificante en el maxilar, lesión reactiva o neoplasia verdadera: reporte de un caso / Peripheral ossifying fibroma in the maxilla, true reactive lesion or tumor: a case report

Se reporta el caso de un paciente joven que presentó la recurrencia de un fibroma osificante periférico en maxilar superior, que a pesar de ser descrito en la mucosa gingival, éste se encontraba socavando una mediana cavidad en el hueso con rechazo de las raíces de los dientes vecinos. Se realizó la eliminación quirúrgica del mismo por medio de curetaje y se maneja una estrecha vigilancia postoperatoria

We are reporting the case of a young patient who presented recurrence of Maxilary peripheral ossifying fibroma (POF). POF is a condition that usually involves the gingival mucosa. In this case, the lesion was eroding a bone cavity, which caused the rejection of the surrounding teeth roots. The surgical resection of the lesion was made by curettage followed by a close post-operative monitoring

Fibroma ossificante juvenil trabecular (tipo OMS): relato de um caso e discussão de parâmetros de diagnóstico diferencial / Trabecular (who-type) juvenile ossifying fibroma: report of a case and

O fibroma ossificante juvenil (FOJ) é uma neoplasia benigna que tem sido distinguida dos fibromas ossificantes pela idade dos pacientes afetados (geralmente abaixo dos 15 anos), sítio anatômico preferencial de ocorrência (maxila), e comportamento biológico agressivo. Nós relatamos um caso atípico de um FOJ de grandes dimensões envolvendo a maxila direita de uma paciente de 28 anos que provocou perfuração das corticais ósseas vestibular e palatina em seis meses deevolução. Uma ampla discussão de critérios histológicos para estabelecimento do diagnóstico deste tumor também foi realizada