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Prader-Willi syndrome is characterized by infantile hypotonia, mental retardation, hyperhagia, hypogonadism and obestiy. Approximately 60% of all PLW syndrome show an interstitial deletion of chromosome 15, 37% have apparently normal chromosome, and 3.6% have a variety of other abnormalities involving chromosome 15. Diabetes mellitus has been considered a component of PLW syndrome and the incidence is about 7%.
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