Teratoma in a feline unilateral cryptorchid testis

A 14- X 12- X 6-cm. (approximately 600 g) cryptorchid testis was surgically removed with the omentum from the posterior portion of the abdominal cavit y of a 2-year-old male American Shorthair cat. At the time of a previous or chiectomy, a unilateral testis had been discovered in the scrotum. The cut surface of the cryptorchid testis consisted of solid areas with many cysts containing fluid and spongy soft areas. Histologically, the cryptorchid tes tis was composed of neuroectodermal components and diffuse immature glial t issues, cystic, tubular, and papillary epithelial tissues, and immature car tilaginous tissues. A metastatic mass in the omentum had histologic structu res similar to those of the cryptorchid testis. The present case was diagno sed as teratoma in a feline unilateral cryptorchid testis.