LAUSR

Abstract: Although reports of tumors in chiropteran species are rare, postmortem examinations conducted on aging captive populations suggest that neoplasia may be more prevalent and clinically more significant contributors to morbidity and mortality than previously appreciated in these animals. A retrospective study was conducted to describe cases of neoplasia identified in Jamaican fruit bats (Artibeus jamaicensis) under human care at the Vancouver Aquarium between 01 January 2013 and 31 March 2021. Approximately 13.2% (N = 47/355) of the bat population died within this time span, and gross and histologic postmortem examinations were performed on 28 of 47 individuals. There were eight malignant and three benign neoplasms detected in 10 cases (eight females, two males), including: malignant histiocytoma, esophageal adenocarcinoma, two squamous cell carcinomas, spindle cell sarcoma, periosteal chondrosarcoma, uncharacterized uterine neoplasia with unrelated multicentric pulmonary carcinoma, and cholangiocarcinoma. Benign variants included three suspected uterine leiomyomas. A wide variety of tumor types and tissue predilections were identified, suggesting a complex and perhaps multifactorial pathogenesis in neoplastic transformation in microchiropterans. To the authors' knowledge, these tumor types have not been previously described in Artibeus sp., and some of these neoplasms have not previously been reported in chiropterans.