title: Characterization of metastatic intestinal adenocarcinoma with differentiation into multiple morphologic cell types in a Virginia opossum.
abstract: A captively maintained mature male opossum (Didelphis virginiana) utilized in a research protocol was presented with clinical signs of chronic diarrhea and severe muscle wasting. At necropsy, there was multifocal mural gastric, intestinal, and urinary bladder thickening, concurrent bilateral hydroureter and hydronephrosis, and extensive fibrous abdominal adhesions. Histologic evaluation revealed intestinal adenocarcinoma with coelomic metastasis to the stomach and urinary bladder. The adenocarcinoma was evaluated using histochemistry and electron microscopy. Paneth, enteroendocrine, and goblet cell differentiation was documented in primary and metastatic sites. This unique presentation of intestinal adenocarcinoma has not previously been reported in the opossum or any other animals. Intestinal neoplasia with Paneth cell differentiation is extremely rare and has been reported in humans with familial adenomatous polyposis.
authors.affiliation: Department of Biomedical Sciences and Pathobiology, VA-MD Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg 24061-0442, USA. mrprater@vt.edu
authors.forename: M R
authors.initials: MR
authors.lastname: Prater
authors.forename: R B
authors.initials: RB
authors.lastname: Duncan
authors.forename: J
authors.initials: J
authors.lastname: Gaydos
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology / Q000556:secondary / Q000662:veterinary*; D000818:Animals; D019858:Enteroendocrine Cells / Q000166:cytology; D020397:Goblet Cells / Q000166:cytology; D007150:Immunohistochemistry; D007414:Intestinal Neoplasms / Q000473:pathology / Q000662:veterinary*; D007421:Intestine, Small / Q000473:pathology; D008297:Male; D008854:Microscopy, Electron / Q000662:veterinary; D009893:Opossums; D019879:Paneth Cells / Q000166:cytology; D013274:Stomach Neoplasms / Q000473:pathology / Q000556:secondary / Q000662:veterinary*; D001743:Urinary Bladder / Q000473:pathology; D001749:Urinary Bladder Neoplasms / Q000473:pathology / Q000556:secondary / Q000662:veterinary*