A rare case of polyorchidism in a cat with four intra-abdominal testes.

Polyorchidism is a rare congenital anomaly defined as the presence of more than two histologically proven testes. We report a case of a 9-month-old European cat with four intra-abdominal testes. The diagnosis was performed by means of ultrasonography, intra-operative examination and histological confirmation. The case reported here presents an extremely rare anomaly, as no previous studies in veterinary medicine have reported the presence of four testes. This case suggests that supernumerary testes should be included as differential diagnoses for intra-abdominal masses.