extrahepatic biliary carcinoma in sloth bears. | extrahepatic biliary carcinoma was found in each of 5 adult sloth bears that died between 1970 and 1984 while on exhibit in ohio zoos. the tumor was characterized by numerous mucin-producing neoplastic glands scattered throughout abundant fibrous stroma. the cause of the tumor was not determined. | 1984 | 6096326 |