Anorchia, is a medical condition where both testes are absent at birth. Within a few weeks of fertilization, the embryo develops rudimentary sex organs, which are crucial to the development of the reproductive system. In the human male, if these fail to develop within 8 weeks, the baby will have female genitalia (see Swyer syndrome). If the testes are lost between 8 and 10 weeks, the baby will have ambiguous genitalia when it's born. However, if the testes are lost after 14 weeks, the baby will have a normal male reproductive system, other than the absence of testes.

Individuals with this condition have a 46,XY chromosome constellation.

Other names for anorchia include

• congenital anorchia
• vanishing testes syndrome
• vanishing testes
• empty scrotum
• testicular regression syndrome (TRS)

See also

References