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A rare syndrome originally described as comprising pulmonary valvular stenosis, cafe-au-lait spots, dull intelligence, and short stature. The phenotype has been later expanded to include macrocephaly and Lisch nodules in the majority of cases, and neurofibromatosis in one-third of the affected persons. Later studies indicate that the characteristics of this condition overlap those of neurofibromatosis and the Noonan syndrome (the neurofibromatosis-Noonan syndrome).
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