Table 1.

Demographics (n=50)

	Mean ± SD (range)
Age at seizure onset	2.1 ± 2.7 yrs (3 days – 13.8 yrs)
Age at surgery	9.1 ± 5.3 yrs (2.5 mos – 21.2 yrs)
Duration of seizures prior to surgery	7.0 ± 5.0 yrs (1 mo – 20.2 yrs)
Length of follow-up	3.5 ± 2.1 yrs (3 mos – 7.8 yrs)
	# (%) of patients
Side of hemispherectomy
Left	32 (64%)
Right	18 (36%)
Etiologies of Epilepsy
Infarct	25 (50%)
Malformations of cortical development	13 (26%)
Rasmussen’s encephalitis	7 (14%)
Sturge-Weber	2 (4%)
Trauma	1 (2%)
Hemiconvulsion-hemiplegia-epilepsy syndrome	1 (2%)
Tumor/radiation therapy	1 (2%)
Additional diagnoses
Pre-existing hemiplegia	28 (56%)
Pre-existing hydrocephalus	7 (14%)
Prior resective surgery
None	37 (74%)
Non-hemispherectomy resection	7 (14%)
Previous hemispherectomy	6 (12%)
Goal of surgery
Seizure freedom	48 (96%)
Palliation	2 (4%)