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Advisor(s)
Abstract(s)
A 9–year-old male European cat was referred for clinical examination with a history of anorexia, apathy and mild dehydration. Neurological exam revealed anisocoria and decreased pupillary reflex. Ultrasound examination of the abdomen suggested the presence of a mesenteric mass and several areas of renal and hepatic lesions. Renomegaly was also observed.
Samples of organs were submitted to the pathology service of the Superior Agrarian School of Viseu.
Macroscopic exam of the liver showed several prominent whitish areas that, on cut section, revealed multilocular cystic appearance with greenish colour in some of them. The mesenteric mass, of friable consistency, showed 5,5 x4,4x3,5 cm On cut section this mass revealed whitish areas of soft consistency that alternated with hemorrhagic areas. The kidneys showed an white, irregular surface, and also in one of them a corical prominent nodule was seen. Several sections were processed for routine histopathological diagnosis.
Microscopic exam revealed that the mesenteric mass corresponded to a tumour of lymphoid cells. Cells were large, with scanty cytoplasm, euchromatic round nucleus with prominent central nucleoli, high mitotic count and moderate pleomorphism invading surrounding adipose tissue. The same type of cells was observed in the liver and kidneys. Based on these results, a lymphoma with renal and hepatic metastases was diagnosed in the mesenteric mass.
Concomitantly, microscopic examination of the liver showed hepatocyte vacuolation and trabecular disorganization, with multiple cystic cavities lined by an epithelium of cubic or squamous type, showing fine fibrovascular tissue stroma. The cuboidal epithelial cells presented a moderate amount of pale eosinophilic cytoplasm, round or oval nucleus, vesicular, oriented centrally and with small or inapparent nucleoli. Based on these results, the diagnosis of neoplasia derived from biliary epithelium, was established.
The differential diagnosis to be considered on this case were colangioma and biliary cystadenoma. The definitive diagnosis of biliary cystadenoma was established, based on the presence of multiple cystic cavities, disseminated by the hepatic parenchyma.
According to previous statements, it was concluded that in spite of its rare occurrence, this is a case of biliary cystadenoma.
Description
Keywords
cat biliary cystadenoma
Citation
Vala H, Nóbrega C, Ribeiro A, Mega C, Oliveira AL, Santos C, Coelho C, Esteves F, Cruz R, Mesquita JR (2009). A case of biliary cystadenoma in a geriatric cat. Revista Portuguesa de Ciências Veterinárias. Supl. 104(569-572): 113-114.