Abstract
The mountain chicken ( Leptodactylus fallax ) is a critically endangered, exceptionally large frog, found only on the Caribbean islands of Montserrat and Dominica. A wild-caught adult female Montserrat mountain chicken housed at the Zoological Society of London was euthanased after a history of lethargy and loss of body weight. On gross pathology, a 1 cm diameter mass was seen in the wall of the large intestine and a 2 mm diameter nodule was present on the cranial pole of the left kidney. On histopathological examination, both masses were identified as adenocarcinomas. Comparison of the histological appearance of the two masses, and characteristics on special staining, suggest that it was an intestinal adenocarcinoma with metastatic spread to the kidney. In mountain chickens, the only neoplasms previously reported are two cases of ovarian dysgerminoma. No aetiology was detected in the case described here. However, we recommend vigilance for future cases in this species, to ensure the success of the breeding programme and the survival of the species.
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