Gosselin S J, Kramer L W
J Am Vet Med Assoc. 1984 Dec 1;185(11):1314-6.
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.
1970年至1984年间,在俄亥俄州动物园展出期间死亡的5只成年懒熊中,每只都发现了肝外胆管癌。肿瘤的特征是在丰富的纤维基质中散在着大量产生黏液的肿瘤性腺管。肿瘤的病因尚未确定。