Anorchidism (Anorchia): Causes, Diagnosis, and Management Anorchidism, commonly known as or "vanishing testis syndrome," is a rare congenital condition characterized by the absence of one (monorchidism) or both (bilateral anorchidism) testes at birth. While the external genitalia appear normal male, the testicular tissue is missing from the scrotum and inguinal canal.
Because the testes existed early in development, they produced necessary Testosterone and Anti-Müllerian Hormone (AMH), resulting in normal male external genitalia. anorchidism
The primary sign is the inability to feel one or both testes in the scrotum. Anorchidism (Anorchia): Causes