Van der Weyden, LouiseAvenant, AlidaO'Dell, Nicolize2024-12-132024-12-132024-02-05Van derWeyden, L.; Avenant, A.; O’Dell, N. Cutaneous Plasmacytoma with Systemic Metastases in a Cape Serotine Bat (Laephotis capensis). Veterinary Sciences 2024, 11, 72. https://DOI.org/10.3390/vetsci11020072.2306-7381 (online)10.3390/vetsci11020072http://hdl.handle.net/2263/99992DATA AVAILABILITY STATEMENT : All data underlying the results are available as part of the article, and no additional source data are required.Despite their relatively long life-spans, reports of neoplasia in bats are rare and are limited to a handful of cases. In this report, we describe a 2-year-old female wild Cape serotine bat (Laephotis capensis) that had been caught by a domestic cat and presented with a skin mass over the chest area. Histopathological analysis of a subsequent biopsy revealed proliferating sheets of neoplastic round cells, occasionally appearing to form packets, supported by a fine, fibrovascular stroma. Marked nuclear pleomorphism was seen, as well as a high mitotic count. Immunohistochemistry displayed positive labelling for MUM1 in the neoplastic cells. The diagnosis was extramedullary plasmacytoma (EMP); a neoplasm consisting of plasma cells derived from B lymphocytes. Due to a deteriorating condition, the bat was anaesthetised, and the mass was surgically removed two weeks later. However, the bat succumbed under the anaesthetic. Histopathological examination of the mass showed the same neoplastic cell population as observed in the biopsy; in addition, there was a locally extensive infiltration of neoplastic cells in the spleen and a mild presence of neoplastic cells in circulation. This is the first report of an EMP in a bat, and we compare the findings with that seen in dogs and cats.en© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.TumourLymphocyteB-cellPlasma cell tumourPlasmacytomaMUM-1MetastasisBatsCape serotine bat (Laephotis capensis)Laephotis capensisSDG-03: Good health and well-beingArticle