An Analysis of 500 cases of Equine Cryptorchidism

Abstract
Left- and right-sided abdominal cryptochidism cases occur with approximately equal frequency in ponies. Approximately half the right-sided unilateral abdominal cases have the epididymal tail descended while only 20% of the left-sided cases do. Inguinal cryptochidism is a relatively more complex phenomenon with incidence changing with age as well as breed. Right-sided retention predominates in young ponies, probably being an extreme expression of testicular hypoplasia, but in older ponies and in other types of horse, retention occurs equally on the left and right.

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