Cryptorchidism.

Cryptorchidism is a common clinical problem in dogs and cats. Retained testes can be unilateral or bilateral, are usually small and atrophied, and vary in location. These factors make diagnosis and surgical removal challenging in some animals. Diagnosis is confirmed using a variety of modalities, including diagnostic imaging in difficult cases. Surgical removal of the affected and normal testes is the treatment of choice. The surgical approach and technique used depend on the location of the retained testis.