Generalized epilepsy in hypothalamic hamartoma: evolution and postoperative resolution.

Abstract:

OBJECTIVE:To better understand the epileptogenesis of symptomatic generalized epilepsy in patients with hypothalamic hamartoma and intractable epilepsy, many of whom experience remission of generalized seizures and slow spike-wave discharges following surgery. METHODS:The authors documented the evolution of symptomatic generalized epilepsy in 12 of 20 children who underwent transcallosal microsurgical hypothalamic hamartoma resection. In seven patients they recorded intraoperative EEG from the hamartoma and simultaneously from the scalp and frontal cortex before, during, and after resection. RESULTS:Gelastic seizures began on average at 6 months of age (range birth to 3 years); tonic seizures began at 6 years (range 2 months to 9 years). Normal EEG were reported in early childhood; thereafter, abnormalities were progressive. Interictal spike-wave was recorded intraoperatively over the scalp and cortex in six patients, but not from the hypothalamic hamartoma. Hamartoma resection had no immediate effect on cortical spike-wave, but waking spike-wave was absent in seven patients on subsequent postoperative EEG. Tonic seizures ceased in 11 of 12 patients, but 6 of these had postoperative generalized seizures that resolved over 1 to 6 months. CONCLUSION:Gelastic seizures in hypothalamic hamartoma arise from the hamartoma itself; the interictal spike-wave does not. The evolution of EEG abnormalities, the development of generalized seizures years after onset of gelastic seizures, and the postoperative running down of interictal spike-wave and generalized seizures in these patients may reflect secondary epileptogenesis.

journal_name

Neurology

journal_title

Neurology

authors

Freeman JL,Harvey AS,Rosenfeld JV,Wrennall JA,Bailey CA,Berkovic SF

doi

10.1212/01.wnl.0000049457.05670.7d

subject

Has Abstract

pub_date

2003-03-11 00:00:00

pages

762-7

issue

5

eissn

0028-3878

issn

1526-632X

journal_volume

60

pub_type

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