[Chromophobe renal cell carcinoma: immunohistochemical study of 7 cases]. / Carcinoma renal de células cromófobas: estudio inmunohistoquímico de siete casos.

UNLABELLED: A series of 7 cases of chromophobe cell carcinoma with clinicopathological correlation is studied. The immunohistochemistry analysis was carried out evaluating in all cases: low and high cytoqueratines (AE1, AE3), membrane epithelial antigen (EMA), vimentin, carcinoembrionary antigen (CEA), proliferative cell nuclear antigen (PCNA) and the oncoproteins p53 and focal c-erbB2. In all cases a diffuse positivity for EMA, AE3 and focal for AE1 was observed, while vimentin and CEA were negative. The positivity for PCNA was always less than 25% of tumoral cells. The oncoprotein p53 was in all cases negative and only in one case a mild and focal positivity for c-erbB2 was observed. CONCLUSIONS: 1) The negativity for vimentin and positivity for EMA, AE1 and AE3 allows to differentiate this carcinoma from clear cell carcinoma. This corroborate a distinct histogenesis, thus suggesting their origin in the intercalar cells of distal collector tubules. 2) The low values of PCNA and the negativity for both oncoproteins p53 and c-erbB2 supports the low aggresivity of this tumor and a better prognostic than other types of kidney carcinomas.

[Primary signet ring cell adenocarcinoma of the bladder. Report of 2 cases of bladder plastic linitis]. / Adenocarcinoma de células en anillo de sello primario de vejiga. Presentación de dos casos de linitis plástica vesical.

OBJECTIVES: Two additional cases of signet-ring cell adenocarcinoma of the urinary bladder, an uncommon highly malignant tumor type, are described. METHODS/RESULTS: The clinical features, histopathological findings and immunohistochemical study are presented. CONCLUSIONS: Both cases previously had cystic glandular cystitis, which supports the totipotent urothelium origin of this neoplasm. Signet-ring cell adenocarcinoma or linitis plastica of the bladder has a highly malignant course despite neoadjuvant chemotherapy and total cystectomy.

[Sudden death in a 4-month-old infant associated with anomalous origin of the left coronary artery]. / Muerte súbita en un lactante de 4 meses asociada a origen anómalo de arteria coronaria izquierda.

We describe the autopsy findings of a 4 months-old boy, who died suddenly after an episode of high airway infection of 3 days time. Autopsy examination showed cardiomegaly (80 g) with widening of the left cavities and thick and white endocardial surface, besides a severe thinning of the cardiac apex at the level of the left ventricle. Left coronary origin was in the pulmonary artery trunk. Histologically, the myocardium shows endomyocardial fibroelastosis and also multiple and extensive areas of old and recent infarcts in the left ventricle. The collateral coronary arteries, were increased in number, and branches showed a marked intimal oedema and a reduction of the luminal diameter.