Hypogonadism in Prader-Willi syndrome.

Prader-Willi syndrome is characterized by eating abnormalities, infantile hypotonia, obesity, mental retardation, and hypogonadism. The causation of hypogonadism varies. We describe a patient with Prader-Willi syndrome whose hypogonadism is secondary to a hypothalamic defect. Individualization of patients with this syndrome is suggested. Based on the particular hormonal abnormality identified, a treatment plan can be constructed. Cryptorchidism should be approached in the usual fashion.