Table 1.

Clinical information of the four patients.

Patient	Age range at surgery	Etiology	Onset of disease	Onset of epilepsy	Type of surgery	Seizure outcome Engel (follow-up)	Affected side
Case 1	25–30	Measles encephalitis	1 year	5 years	Right frontal lobectomy and disconnection of the anterior two thirds of the corpus callosum	Ia (12 months)	L
Case 2	30–35	Severe head injury	6 months	9 months	Right fronto-central cortectomy and disconnection of fronto-central areas	Ia (34 months)	L
Case 3	35–40	Perinatal anoxia	0	6 years	Left frontal lobectomy and disconnection of about half of the corpus callosum	Ia (49 months)	R
Case 4	25–30	Ischaemic stroke	2 years	12 years	Left fronto-parietal cortectomy and fronto-parietal disconnection	IV (33 months)	R