Atypical cytomorphologic description of a seminoma in a rabbit.

Seminoma is reported as a rare disease associated with specific micro-morphologic findings. In the present report, we describe the case of a testicular seminoma in a 7-year-old Holland Lop rabbit, in which the cytology presented an atypical pattern. Upon presentation, the left testicle was severely enlarged, and the patient also had a history of radiation therapy for a previously diagnosed thymoma. Following excision and histopathology of the abnormal organ, results showed a mixed intratubular-diffuse pattern with evidence of torsion. Moreover, cytology revealed a cohesive pattern with multiple malignancy criteria. To our knowledge, this is the first published report of a seminoma with these cytologic features.