Noonan Syndrome

Prevalence estimates ofNoonan syndrome (NS) range from 1 in 1000 births to 1 in 2500 births. Males and females are equally affected, and no racial or geographical differences have been reported. Physical manifestations of NS include craniofacial abnormalities (e.g., small jaw, low-set ears that are angled toward the posterior, a deep groove in the philtrum, and a high arched palate), congenital heart disease, skeletal abnormalities (e.g., short stature, webbed neck, and abnormalities of the thorax), and genital malformations. Intellectual functioning ranges from mild mental retardation to superior intellectual levels.

Although further research is necessary regarding the social-behavioral aspects of persons with NS, it is known that social interactions may be deficient because of other concomitant disorders (e.g., low muscle tone impacts athletic participation). Overall, children with NS seem to mature more slowly than their typically developing peers, and they often prefer to play with younger children. No evidence of behavioral or psychiatric disorders comorbid with NS has been reported.

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