An undescended testis or cryptorchidism is a condition in which the testis has not moved into its proper position, i.e. the scrotum before birth. Usually just one testis is affected. But in about ten percent of the cases, both the testes are undescended.
An undescended testis is generally rare in full-term babies, but common in baby boys born prematurely.
The vast majority of the time, the undescended testis moves into the proper position on its own, within the first few months of life. If the undescended testis does not correct itself, surgery can relocate the testis into the scrotum.
Cryptorchidism is a condition in which one or both of the testes fail to descend from the abdomen into the scrotum.
The scrotum is a bag of skin that hangs from the body at the front of the pelvis, between the legs in males. It accommodates the testes.