Cryptorchidism, a term of Greek origin (κρυπτος = hidden, ορξις = testis), is found in ca. 30% of premature infants and in 4% of full term babies. The testes remain in the abdominal cavity or somewhere on their way to the scrotum most frequently in the inguinal canal (60% of the cases). One should not confuse the concept of cryptorchidism with a testicular ectopia, in which the testes take on an abnormal location due to a deviant migration. Cryptorchidism can occur unilaterally or bilaterally (20-40% of all cryptorchidisms).
The cause of this disorder remains unknown but it seems to be connected with an insufficient production of androgens (possibly through a change at the level of the hypothalamus-pituitary axis). An undescended testis is normal up till birth, but already during the first year there are histological alterations (frequency of testicular tumors is elevated by 20-40%; there also exists a risk of sterility).
The first treatment step consists in giving gonadotropic hormones (HCG) with a success rate of 20-50% or, if this remains unsuccessful, in a surgical intervention (orchidopexy). Here the testis is surgically brought down into the scrotum.
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