Unilateral luteoma of the ovary in a pregnant Risso’s dolphin(Grampus griseus)

[摘要] A white, lobular mass was found in the right ovary of a pregnant Risso’s dolphin(Grampus griseus) at necropsy. The mass was unilateral and occupiedmost of the pre-existing ovarian tissue. Histologically, the mass was composed of diffusesheets of polyhedral cells with abundant eosinophilic cytoplasm and oval nuclei, separatedby fibrous connective tissue. Only a few ovarian follicles were observed at the peripheryof the mass. Immunohistochemically, the large eosinophilic cells were positive forvimentin and negative for pan-cytokeratins. Based on the histopathological features, thepresent case was diagnosed as luteoma. In human medicine, luteoma of pregnancy, atumor-like proliferative lesion occurring in pregnant women, is well described. Inveterinary medicine, luteoma associated with pregnancy has never been described. Thepresent study would provide useful information for understanding the characteristics ofluteoma in animals.

[学科分类] 兽医学

[关键词] dolphin;luteoma;ovary;pregnancy;sex cord-stromal tumor