SEIZURE OUTCOME FROM ANTERIOR AND COMPLETE CORPUS CALLOSOTOMY

Eighty patients underwent anterior corpus callosotomy for treatment of generalized seizures. The patients' mean age was 18.3 years (range 4 to 53 years); the mean age at seizure onset was 5.27 years (range 0.1 to 27 years). The mean intelligence quotient (IQ) of 41 testable patients was 71.12 (range < 30 to 114). The seizure outcome was as follows: 13% were seizure-free, 65% were significantly improved, and 22% were unchanged. Ten patients subsequently underwent a second operation to complete the callosal sectioning which resulted in additional seizure improvement in only five of them. Five complications resulted from 90 operations: two epidural hematomas, one delayed subdural hematoma, one bone-flap infection, and one postcallosotomy disconnection syndrome; two patients died. A younger age at onset of seizures, a higher IQ, and generalized tonic-clonic, atonic, complex-partial, and mixed seizure types were associated with improved seizure outcome.