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| Prader-Willi Syndrome Labhart-Willi Syndrome | Royer Syndrome | Labhart-Willi-Prader-Fanconi Syndrome | Royer' | s Syndrome | Labhart Willi Prader Fanconi Syndrome | Labhart Willi Syndrome | Prader Willi Syndrome | Royer Syndromes | Royers Syndrome | Syndrome, Royer A chromosomal disorder associated with a deletion of the proximal portion of the long arm of chromosome 15 (15q11-q13) in the majority of affected individuals. The abnormalities occur exclusively on the paternally derived chromosome 15. Clinical manifestations include MENTAL RETARDATION, muscular hypotonia, OBESITY, hyperphagia, short stature, hypogonadism, strabismus, and hypersomnolence. (Menkes, Textbook of Child Neurology, 5th ed, p229) |