We report the case of a 20-year-old woman,vith Noonan syndrome. She ha
d severe mental retardation and intractable epilepsy. Magnetic resonan
ce imaging revealed dilated perivascular spaces and a dysplastic lesio
n in the left temporal lobe, which is thought to have caused her neuro
logic symptoms, These findings suggest that neuronal in addition to so
matic migration can be impaired in Noonan syndrome. (C) 1997 by Elsevi
er Science Inc. All rights reserved.