We report hemimegalencephaly in a 44-year-old woman with mental retardation
, epilepsy and a mild hemiparesis. In addition to typical findings on MRI,
2-deoxy-2[F-18]fluorodeoxyglucose positron-emission tomography (PET) demons
trated glucose hypometabolism of the affected hemisphere. The results of PE
T have been coregistered with morphological information from the MRI studie
s by image fusion.