Cryptorchid investigation of an adult cob pony with unknown history

Abstract

AbstractA 400 kg, male, adult cob pony presented with a history of stallion‐like behaviour without testicles palpable. The blood oestrone sulphate level was 4.90 ng/ml, consistent with cryptorchidism (0.1–10.0 ng/ml; IDEXX). Age was estimated at 8 years by dentition. Previous veterinary treatment history was unavailable. Examination under general anaesthesia found no evidence of prior surgical castration. Investigation of the inguinal region was unremarkable with no evidence of an inguinal extension of the gubernaculum testis or vaginal process on either side. Exploratory laparotomy of the right abdomen revealed a cystic, 5 × 8 cm mass with homogenous tapering stalk. This was removed by emasculation. Histological examination identified the mass as a benign testicular teratoma. Blood anti‐Mullerian hormone 5 days after the surgery measured 0.9 ng/ml. The pony made a full recovery and the owner reported the behavioural issues have resolved.