Table 1.

Demographics on 690 hemispherectomy patients.

Male	343 (49.7%)
Age (yrs, mean ± s.d., range)	7.0 ± 6.8 (0.08 – 42)
Follow-up period (yrs, mean ± s.d., range)	2.9 ± 3.5 (0 – 24.8)
Etiology of epilepsy
Cortical dysplasia	237 (34%)
Rasmussen’s encephalitis	152 (22%)
Stroke	148 (21%)
Sturge-Weber	26 (4%)
Trauma	24 (3%)
Idiopathic	16 (2%)
Tumor	9 (1%)
Other	56 (8%)
Not specified	22 (3%)
Hemispherectomy technique
Functional	435 (63%)
Anatomic	244 (35%)
Hemicorticectomy	11 (2%)
Prior cranial surgery	122 (18%)
Lobar/multilobar resection	41 (6%)
Lesionectomy/topectomy	13 (2%)
Hemispherectomy	12 (2%)
Other	56 (8%)
Basal ganglia/thalamus involved in resection	219 (32%)
Perioperative CSF drainage	485 (70%)
Post-operative infection	50 (7%)