Extrahepatic Cholangiocarcinoma in an adult Black Howler Monkey (Primates: Atelidae)

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Mariele de Santi
https://orcid.org/0000-0003-0466-5563
CAROLINE DO COUTO
https://orcid.org/0000-0003-0765-8166
GABRIEL LUIZ MONTANHIM
https://orcid.org/0000-0002-9830-041X
PAOLA CASTRO MORAES
https://orcid.org/0000-0002-0255-2971
PAULO HENRIQUE LEAL BERTOLO
https://orcid.org/0000-0002-9604-3624
ROSEMERI DE OLIVEIRA VASCONCELOS
https://orcid.org/0000-0003-2319-5309
ACÁCIA REBELLO COUTINHO
https://orcid.org/0000-0003-0533-5988
KARIN WERTHER
https://orcid.org/0000-0002-8822-488X

Abstract

Over the past years, the number of neoplasm cases reported in nonhuman primates have considerably increased, with hepatocellular tumors reported in several species. Here a case report of extrahepatic cholangiocarcinoma in an adult male Black Howler Monkey (Alouatta caraya) is presented. The animal, kept as pet, was admitted at Veterinary Hospital presented clinical signs of cholestasis. After unsuccessful drug treatment, the animal was submitted to a cholecystoduodenostomy. During the surgical procedure, the hepatobiliary system was meticulously observed. The liver showed no macroscopic alterations, however, there was a solid mass throughout the common bile duct. Biopsy specimens were collected from the bile duct mass, liver and gallbladder for histological and immunohistochemical evaluations. Histological examination of the liver showed diffuse accentuated vacuolization and necrosis, besides hemosiderin accumulation inside hepatocytes. In the portal region, there was an accentuated proliferation of biliary ducts, which presented replete with bilirubin. Discrete neutrophilic inflammatory infiltrate and fibrosis were also observed. The bile duct mass showed a cellular proliferation of epithelial origin, confirmed by immunohistochemical analysis. The arrangement, characteristics and growth pattern of these cells revealed a malignant neoplasm. Despite the success of the procedure, the animal died hours later. Cholangiocarcinomas generally present high mortality rates, since its late clinical presentation make the treatments ineffective due to its large extensions at the time of diagnosis. The owner did not allow the necropsy, therefore the presence of other neoplasms and important organ alterations, which may be aggravated the patient's clinical condition, were not confirmed.

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How to Cite
de Santi, M., COUTO, C. D., MONTANHIM, G. L., MORAES, P. C., BERTOLO, P. H. L., VASCONCELOS, R. D. O., COUTINHO, A. R., & WERTHER, K. (2019). Extrahepatic Cholangiocarcinoma in an adult Black Howler Monkey (Primates: Atelidae). Brazilian Journal of Veterinary Medicine, 41(1), e101519. https://doi.org/10.29374/2527-2179.bjvm101519
Section
Case report

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