All male kittens are born with their testicles up in the abdomen. Normally by the time the kitten is 6 weeks old both of the testicles have descended into the scrotal sack. However in the case of cryptorchidism one, or both, of the testicles fail to come down into the scrotal sack and remain in the abdomen.
Cryptorchidism, a condition in which one or both of the testicles fails to descend into the scrotal sack, is a rare condition that occurs most often in Persian cats. In most cases, when cryptorchidism does occur in cats, one of the testicles will descend by the time the cat is 6 weeks old, and the other testicle remains within the abdominal area.