Presentación de un caso de quiste dermoide con ubicación poco frecuente / Presentation of a dermoid cyst case with an unusual location

El quiste dermoide es una patología benigna de origen embrionario y su localización en el piso de la boca es poco frecuente. No presenta predilección por sexo y aparece, especialmente, entre la segunda y la tercera década de vida. Para su diagnóstico son útiles las tomografías computadas y las resonancias nucleares magnéticas. El tratamiento es quirúrgico. Tanto las recidivas como la transformación maligna son excepcionales

The Dermoid Cyst is a benign pathology of embrionary origin and its localization in the floor of the mouth is not very frequent. With no preference for sex, it appears especially between the second and third decades of life. Computed scans and magnetic nuclear reso-nances are useful for its diagnosis. The treatment is surgical and recurrences, as well as malignant transformation, are exceptional

Epitelioma calcificante de Malherbe (Pilomatrixoma) en la región parotídea. Presentación de un caso clínico / Calcifying epithelioma of Malherbe (Pilomatrixoma) in the parotid area. Report of a case

Normalmente, la presencia de un tumor en la región maxilofacial obliga realizar un minucioso estudio del paciente ya que los tumores en esta localización pueden tener diversa etiología. El estudio comprende un examen clínico completo, exámenes auxiliares, métodos de biopsia, etc. En este artículo se presenta el caso clínico de un paciente con una tumoración en la región parotídea que luego de realizar los exámenes correspondientes se llegó al diagnóstico de Pilomatrixoma o Epitelioma calcificante de Malherbe, entidad patológica que no es de frecuente aparición y cuyas características serán detalladas en este artículo (AU)

[Cerulein-induced acute pancreatitis enhanced by chronic hyperlipidic diet in the rat]. / La dieta hiperlipídica crónica intensifica la pancreatitis aguda inducida por ceruleina en la rata.

The object of the present work was to study the relationship between acute pancreatitis (PA) and hyperlipidic diets. PA was induced by Caerulein (CE) by a single intraperitoneal doses (50 mcg/kg), after feeding the rats during 6 weeks with an hyperlipidic diet (45%). Rats with a normolipidic diet (lipids 5%) were used as control. The increase of serum lipase was similar in both groups treated with CE (control and with hyperlipidic diet). There were increase of interstitial edema, cariorrexis and a specially marked increase in the level of vacuolization of acinar cells with respect to the control group. It was concluded that chronic hyperlipidic diet increases histopathologic lesions in PA induced by CE in rats.

La dieta hiperlipidica cronica intensifica la pancreatitis aguda inducida por ceruleina en la rata / Cerulein-induced acute pancreatitis enhanced by chronic hyperlipidic diet in the rat

El modelo experimental de pancreatitis aguda (PA) inducido por ceruleína (CR) está caracterizado por un significativo aumento de la lipasa sérica, edema inersticial pancreático, observación poco frecuente de cariorrexis y aparición de vacuolas acinares. Ratas Wistar macho adultas fueron alimentadas por una dieta hiperlipídica (lípidos al 45 por ciento) durante 6 semanas, usando como control ratas con dieta normolipídica (lipidos 5 por ciento). Se indujo una PA mediante una dosis única de CR intraperitoneal de 50 mugr/Kg. El incremento de la lipasa sérica fue similar en ambos grupos tratados con CR (dieta control e hiperlipídica). Por otra parte se comprobó incremento del edema intersticial, de la cariorrexis y fundamentalmente del grado de vacuolización de las células acinares con respecto al grupo control. Se concluye que la dieta hiperlipídica administrada en forma crónica intensifica las lesiones histopatológicas de la PA inducida por CR. (AU)

La dieta hiperlipidica cronica intensifica la pancreatitis aguda inducida por ceruleina en la rata / Cerulein-induced acute pancreatitis enhanced by chronic hyperlipidic diet in the rat

El modelo experimental de pancreatitis aguda (PA) inducido por ceruleína (CR) está caracterizado por un significativo aumento de la lipasa sérica, edema inersticial pancreático, observación poco frecuente de cariorrexis y aparición de vacuolas acinares. Ratas Wistar macho adultas fueron alimentadas por una dieta hiperlipídica (lípidos al 45 por ciento) durante 6 semanas, usando como control ratas con dieta normolipídica (lipidos 5 por ciento). Se indujo una PA mediante una dosis única de CR intraperitoneal de 50 mugr/Kg. El incremento de la lipasa sérica fue similar en ambos grupos tratados con CR (dieta control e hiperlipídica). Por otra parte se comprobó incremento del edema intersticial, de la cariorrexis y fundamentalmente del grado de vacuolización de las células acinares con respecto al grupo control. Se concluye que la dieta hiperlipídica administrada en forma crónica intensifica las lesiones histopatológicas de la PA inducida por CR.

Gastric acid secretion response in the Cebus apella. A monkey model of chronic Chagas' disease.

The objective was to study the secretory pattern, both basal and stimulated either by histamine (0.1 mg/kg) or pentagastrin (64 micrograms/kg) in eighteen Cebus apella monkeys chronically infected with different T. cruzi strains (CA1, n = 10; Colombian, n = 4 and Tulahuen, n = 4) and to describe the morphological findings in the gastrointestinal tract in twelve infected (6 sacrificed and 6 spontaneously dead) and four healthy monkeys. All infected monkeys and 35 healthy ones were evaluated by contrast X-ray examination. No differences were observed in basal acid output between control and infected groups. Animals infected with the Tulahuen and Colombian strains showed significant lower values of peak acid output in response to histamine or pentagastrin (p < 0.01 and p < 0.05 respectively; "t" test) in comparison to the controls. Barium contrast studies showed enlargement and dilatation of the colon in three infected animals. Histopathological lesions were seen in 75% of the autopsied animals either in colon alone (33%) or both, in colon and esophagus (42%). The normal secretion observed in the CA1 infected group could be due to a lower virulence of the strain, a lower esophageal tropism or the necessity of a longer post-infection time to cause lesions.

Oral squamous cell carcinoma in capuchin monkeys (Cebus apella). Report of two cases.

Two neoplasms were observed in two feral male Cebus apella monkeys of approximately 12 and 14 years of age. Histologically, the tumors were well-differentiated squamous cell carcinomas, one affecting the soft and hard palates reaching the nasal cavity and the other involving the oral cavity floor and the inferior maxillar.

Electrocardiographic changes in chronic Trypanosoma cruzi infected Cebus apella monkeys.

PURPOSE: To evaluate electrocardiographic data of Cebus apella monkeys with Chagas' disease. MATERIAL AND METHODS: 53 Cebus apella monkeys (juvenile and adult of both sexes) were used: 35 as a control group and 18 inoculated four-five years ago with 3 different Trypanosoma cruzi strains (CA1, n = 10; Colombian, n = 4; Tulahuen, n = 4). RESULTS: The normal electrocardiogram (ECG) showed differences with that of man, a) high cardiac rate; b) presence of "pulmonary p" wave without pulmonary pathology. The ECT alterations found between 11 and 58 months after last inoculation were: right bundle branch block; intermittent right bundle branch block; left ventricle overload; repolarization disturbances; left anterior hemiblock; extra systole. These alterations resemble those found in humans, as well as clinical parasitological and immunological alterations. Their incidence and the time at which they appeared, seem to vary according to the route, strain, inoculum and frequency of the inoculation. Three of the monkeys died spontaneously 46, 48 and 52 months after the infections due to the natural evolution of the disease, and six were sacrificed during the follow-up. In both cases histopathological lesions were found, and their intensity was directly related to the time and resembled the human disease. CONCLUSION: The Cebus apella, as it reproduces human electrocardiographic and histopathological alterations, a short time after experimental infection, is a suitable model for the study of the different aspects of the physiopathology, immunopathology and therapeutics of the indeterminate and chronic phases of Chagas' disease.

Chronic myocardial damage in experimental T. cruzi infection of a New World primate, Cebus sp. monkey.

Eighteen Cebus apella monkeys, (juvenile and adult of both sexes) were inoculated five years ago, with three Trypanosoma cruzi strains (CA1, n = 10; Colombian, n = 4 and Tulahuen, n = 4), either by conjunctival or intraperitoneal route, once or repeatedly. Parasitological, hematological, serological, enzymatic, radiographic, electro and echocardiographic findings have been previously published and they are similar to those observed in human pathology. The most frequent electrocardiographic alteration was right branch bundle block. Six animals, chosen at random, were sacrificed. Those sacrificed 20 to 25 months post-first inoculation showed focal accumuli of leukocytes with myocytolysis. Foci of diffuse interstitial fibrosis with mild infiltrate of leukocytes among fibers were observed in the animals sacrificed 36 to 47 months post-inoculation. No parasites were seen. The lesions were more prominent in the ventricular walls and the septum. The fact that the infiltrates were predominant in the animals sacrificed at a shorter time after first inoculation and that fibrosis was more severe in those sacrificed at a longer time suggests that there is a progression of the infiltrative lesions to fibrosis, with a leukocytic activity indicative of a chronic phase. These lesions are similar to those described in human chronic Chagas' disease. This would demonstrate that this model is useful in evaluating a progress in the knowledge of the pathogenesis which is still a controversial issue, immunology, immunogenesis and chemotherapeutic agents of the chronic and indeterminate phases of this disease.

Susceptibilidad del mono Cebus apella a la inoculación de distintas cepas de Trypanosoma cruzi / Susceptibility of the monkey Cebus apella to inoculation with different strains of Trypanosoma cruzi

Con el propósito de determinar si el primate Cebus apella del Nuevo Mundo puede servir como modelo experimental de la infección chagásica crónica del ser humano, se inocularon por vía intraperitoneal y conjuntival tres grupos de estos monos con las cepas CA1, colombiana y Tulahuen de Trypanosoma cruzi. Luego se reinocularon de vez en cuando algunos de los animales con el fin de aproximar más a las características normales de la infección en el hombre, y se efectuaron una serie de pruebas parasitológicas, hematológicas, serológicas, enzimáticas, radiográficas, electrocardiográficas, ecocardiográficas y anatomopatológicas destinadas a identificar el parásito y seguir el curso de la enfermedad. Se establecieron las comparaciones apropiadas con un grupo testigo. Los resultados indican que la inoculación de dichos primates con tres cepas de T. cruzi no provocó alteraciones clínicas comprobables durante la fase aguda de la infección, pero causó luego alteraciones cardíacas y colónicas similares a las observadas en casos crónicos de la enfermedad de Chagas en el hombre. Las lesiones histopatológicas encontradas en la necropsia también fueron semejantes a las observadas en la forma humana de la enfermedad. Estos resultados, sumados a la asequibilidad de estos monos y el costo relativamente bajo de mantenerlos en cautiveiro, indican que la especie Cebus apella podría ser el modelo animal más adecuado y asequible de la forma crónica de la enfermedad de Chagas

Susceptibilidad del mono Cebus apella a la inoculacion de distintas cepas de Trypanosoma cruzi / Susceptibility of the monkey Cebus apella to inoculation with different strains of Trypanosoma cruzi

For the purpose of determining whether the New World monkey Cebus apella is a suitable experimental model for chronich Chagas' disease in humans, three groups of these monkey were inoculated by the intraperitoneal and conjunctival routes with the CA1, Colombian and Tulahuen strains of Trypanosoma cruzi. Afterwards, some of the animals were reinoculated from time to time in order to approximate more closely the normal characteristics of the infection in man, and a series of parasitologic, hematologic, serologic, enzymatic, radiographic, electrocardiographic, echocardiographic and anatomopathological tests were made to identify the parasite and monitor the course of the disease. Appropriate comparisons were made with a control group. The results indicate that inoculating those primates with three strains of T. cruzi caused no verifiable clinical changes during the acute phase of the infection, but afterwards caused cardiac and colonic impairments similar to those seen in chronic human case of Chagas' disease. The histopathological lesions found in autopsy were also similar to those found in the human form of the disease. These results, joined to the availability of these monkeys and the relatively low cost of keeping them in captivity, indicate that the species Cebus apella could be the most suitable and available animal model for the chronic form of Chagas' disease

Acid phosphatase in human breast cancer tissue.

When the total acid phosphatase (AP) activity of mammary carcinoma was compared with those of benign pathology and normal mammary tissue the results showed statistically significant differences (P less than 0.05) when expressed per milligram of protein: 358 +/- 42 nmoles per hour (mean +/- standard error) in the malignant tumor, 216 +/- 30 in the benign pathology, and 96 +/- 45 in normal tissue and when expressed per milligram of DNA: 1858 +/- 234, 1227 +/- 140, 695 +/- 345 nmoles per hour, respectively. The polyacrylamide gel electrophoretic profiles showed different levels of isoenzymes 3 and 4 in the three tissue groups. The appearance of isoenzyme 1 is reported after treatment of the homogenates with 5% Triton X-100. It was also found by counterimmunoelectrophoresis that the 28,000 Xg mammary tumor supernatant cross reacts with an antiserum raised against AP isoenzyme 2 although the mammary tissue does not contain such an isoenzyme. To elucidate this point, isoenzymes 1, 3 and 4 were separated by columns of Sephadex G-200 and DEAE-Sephadex. By counterimmunoelectrophoresis, it was observed that only the fraction containing isoenzyme 4 cross-reacted with the antiserum anti-AP isoenzyme 2 maintaining the catalytic activity.