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Extrahepatic biliary carcinoma in sloth bears.

S J Gosselin, L W Kramer

    Journal of the American Veterinary Medical Association
    |December 1, 1984
    PubMed
    Summary

    Five adult sloth bears in Ohio zoos developed extrahepatic biliary carcinoma, a type of bile duct cancer. The tumors featured numerous mucin-producing neoplastic glands within fibrous stroma. The exact cause remains undetermined.

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    Area of Science:

    • Veterinary Pathology
    • Comparative Oncology
    • Wildlife Health

    Background:

    • Extrahepatic biliary carcinoma is a rare malignancy affecting the bile ducts outside the liver.
    • Sloth bears (Melursus ursinus) are vulnerable animals with limited research on their specific neoplastic diseases.
    • Zoo environments may present unique health challenges for exotic animals.

    Purpose of the Study:

    • To document and characterize extrahepatic biliary carcinoma in a small cohort of captive adult sloth bears.
    • To provide histopathological details of the observed tumors.
    • To highlight potential health concerns in zoological populations.

    Main Methods:

    • Histopathological examination of tumor tissues from deceased sloth bears.
    • Gross and microscopic analysis of neoplastic lesions.
    • Review of case histories and necropsy findings.

    Main Results:

    • Five adult sloth bears that died between 1970 and 1984 were diagnosed with extrahepatic biliary carcinoma.
    • Tumors were histologically described as numerous mucin-producing neoplastic glands within abundant fibrous stroma.
    • The specific etiology or cause of the observed tumors could not be determined from the available data.

    Conclusions:

    • Extrahepatic biliary carcinoma occurred in a small group of captive sloth bears.
    • The characteristic histopathological features of these tumors were documented.
    • Further research is needed to elucidate the causes and risk factors for this cancer in sloth bears.

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