Table 1.

Demographic data.

A total of 20 subjects were included.
Total number of subjects	20
Males	12 (60%)
Females	8 (40%)
Age at surgery (mean; range)	12 years; 5.1 years to 19 years
Seizure onset (mean; range)	4.0 years; 2 weeks to 10 years
Etiology
Unknown	14
Structural/metabolic	4
Genetics	2
Seizure types- number of patients (percentage)
seizures leading to falls	13 (65%)
Tonic	9 (45%)
Atonic	5 (25%)
Myoclonic	1 (5%)
Rapidly spreading focal seizure	9 (45%)
Generalized tonic clonic seizure	10 (50%)
Atypical absence	1 (5%)
Epileptic spasms	4 (20%)
Dyscognitive focal seizure
With vagus nerve stimulator	9 (45%)
Duration of epilepsy prior to corpus callosotomy	8.41 years; 1 year to 18 years
Extent of corpus callosotomy
Total	15 (75%)
Two-third	3 (15%)
Two-third followed by Total	2 (10%)
Technique
Craniotomy	10
Endoscopy	10
Anterior approach	8
Posterior approach	2