Results of biliopancreatic diversion in two patients with Prader-Willi syndrome.

Prader-Willi Syndrome (PWS) is a genetic disorder characterized by hypotonia, mental retardation or learning disability, hyperphagia and compulsive eating due to hypothalamic dysfunction. Obesity is a major cause of increased morbidity and mortality among patients with PWS. Gastric restrictive surgery has been associated with partial breakdown of the staple-line in PWS.