Feline Cryptorchidism Study Guide

Overview and Clinical Importance

Cryptorchidism (from Greek kryptos meaning "hidden" and orchis meaning "testicle") refers to the failure of one or both testes to descend into the scrotum. This congenital condition is the most common developmental defect of the male reproductive tract in cats, though it occurs less frequently in cats compared to dogs. The prevalence in cats ranges from 0.37% to 6.2%, with purebred cats showing significantly higher incidence rates of 10% to 29% in breeds such as Persians and Himalayans.

Cryptorchidism represents a significant clinical concern due to its association with serious complications including testicular neoplasia, spermatic cord torsion, and persistent male behaviors. Understanding the embryology, diagnosis, and surgical management of this condition is essential for veterinary practitioners and board examination success.

Embryology and Pathophysiology

Normal Testicular Descent

Testicular descent is a complex process involving hormonal, mechanical, and genetic factors. The testes initially develop adjacent to the caudal pole of each kidney in the fetal abdomen and must migrate to their final scrotal position through a precisely orchestrated sequence of events.