A three and half-year-old colt was presented to the Department of Surgery and Radiology, Veterinary College, Bangalore with a history of swelling in the scrotum for two months. On clinical examination, a hard-uniform mass of testicle palpable within the left scrotal sac. The gelding was performed using xylazine and ketamine anesthesia. Histopathology confirmed the case as diffuse testicular seminoma. With a course of antibiotic, analgesic and with regular wound dressing, the animal showed uneventful recovery.