Stereotactic laser ablation for hypothalamic and deep intraventricular lesions

Area of Science:

• Neurosurgery
• Oncology
• Neurology

Background:

• Laser ablation is a minimally invasive MRI-guided thermal energy procedure.
• It is increasingly used for deep or inoperable brain lesions like hypothalamic hamartoma (HH), subependymal giant cell astrocytoma (SEGA), and hypothalamic/third ventricular tumors.

Purpose of the Study:

• To review early institutional experience with laser ablation for brain lesions.
• To characterize clinical outcomes in patients undergoing this procedure.

Main Methods:

• Retrospective cohort review of 12 patients.
• Analysis of clinical and radiographic records.

Main Results:

• Successful laser ablation in all patients; no permanent complications.
• 17% experienced acute obstructive hydrocephalus or shunt malfunction.
• 67% seizure freedom (Engel Class I) for HH, with others showing >90% seizure reduction.
• Durable tumor control for 2/3 SEGA cases, with one receiving everolimus.
• Partial tumor control in 1/3 palliative cases for hypothalamic/third ventricular tumors.

Conclusions:

• Laser ablation is safe, durable, and effective for HH.
• It shows effectiveness for SEGA local control, especially with everolimus.
• Palliative use for other deep tumors was less successful and carried higher risks.