Treatment modality for intractable epilepsy in hypothalamic hamartomatous lesions

Area of Science:

• Neurology
• Neurosurgery
• Pediatric Epilepsy

Background:

• Hypothalamic hamartomas (HHs) are congenital malformations linked to severe early-onset epilepsy, specifically gelastic seizures.
• This condition represents a significant challenge in pediatric epilepsy syndromes, often proving refractory to medical management.

Purpose of the Study:

• To evaluate the efficacy of different treatment modalities for intractable epilepsy associated with hypothalamic hamartomas.
• To present a treatment approach for hypothalamic hamartomatous lesions causing refractory seizures.

Main Methods:

• A cohort of 14 patients with medically refractory seizures due to HHs was studied.
• Diagnosis was confirmed via MRI, with one case verified histologically.
• Epileptic focus identification involved comprehensive investigations, including depth electrode EEG recordings within the hamartoma.

Main Results:

• Treatments included surgical resection (1 patient), gamma knife radiosurgery (4 patients), and endoscopic disconnection (11 patients).
• Endoscopic disconnection resulted in immediate seizure freedom for six patients.
• Gamma knife radiosurgery failed to control seizures in two patients, but their gelastic seizures resolved after subsequent endoscopic disconnection.

Conclusions:

• Hypothalamic hamartomas are intrinsically epileptogenic.
• Blocking seizure propagation from HHs through disconnection appears effective, irrespective of the specific modality.
• Endoscopic disconnection of HHs demonstrates superior safety and efficacy compared to other treatment options.