An undescended testicle is a condition which influences about 4% of newborn boys. The testicles, where male hormones and sperm are delivered, start their advancement in the mid-region alongside the kidneys. With development before conception, they ordinarily slide through the crotch into the scrotal sac.
In a few boys the plunge of one or both testicles is inadequate, with the testicle coming to lay some place along the course of its drop from the mid-region to the scrotum. This is regularly discovered by physical examination not long after conception.