Clinical histories and operative details of patients 2 to 5

Patient Sex	Age at onset of seizures (y)	Seizure type and approximate frequency before surgery	Age at surgery (y)	Tumour location and surgical procedure	Outcome and duration of follow up
2 Male	7	Partial (1/week) and generalised seizures (1/week).	24	Right frontal. Removal of cystic mass (total excision).	Only one seizure since surgery. Postoperative EEG shows no epileptiform activity. 2 year follow up
3 Male	9	Complex partial seizures and generalized seizures (2–3/week).	27	Left temporal. Lesionectomy; lower middle and inferior temporal gyrus.	Seizure free. 18 month follow up.
4 Female	6	Absence and generalised seizures (2/week).	20	Left frontal. Subtotal (80%) excision: due to tumour location in motor cortex.	Continues to have seizures, although decreased in frequency (2/month). 18 month follow up.
5 Female	6	Complex partial seizures (5–10/month) and generalised seizures (5/year).	41	Right frontal. Cystic lesion extending to cortex. Cyst drained and partial resection of tumour.	Marked reduction in seizure frequency. 1 year follow up.