The number of patients with right-sided hemimegalencephaly (n = 29) was almost twice that of patients with left-sided hemimegalencephaly (n = 15). Forty-one patients had mental retardation and ...

The questionnaires were distributed to 1200 hospitals, and answers were obtained from 328 hospitals (27.3%). There were 38 patients with hemimegalencephaly from 32 hospitals. Information on these ...