Laser Interstitial Thermal Therapy (LITT) in pediatric neurosurgery: Single center retrospective analysis of 41 consecutive procedures.

[INTRODUCTION] Laser Interstitial Thermal Therapy under MRI control has emerged as a safe and efficient alternative to microsurgery in epilepsy and neurooncology procedures. Yet it has been used only recently in seldom European centers. Here, we report our 4 years' experience with LITT in children (complications, epileptic and oncologic outcomes).

[METHODS] Single center retrospective study of consecutive LITT procedures during the 2021-2024 period. LITT was restricted to pediatrics in the following indications: (i) circumscribed lesion (ii) benign pathology (iii) problematic location for microsurgical resection. After a robotic stereotactic implantation, ablation was performed under MRI guidance with the VISUALASE system. Post operative outpatient clinic and MRI were systematic at 1, 3, 6 and 12 months. Epileptic outcome was defined after ILAE classification, oncological relapse was defined as a volumetric increase after 1 month of follow up.

[RESULTS] 35 children (mean age 11.4yo, M/F ratio = 0.8) were operated in 41 successive procedures. Main indication was focal epilepsy (n = 28 patients; FCD n = 13, LEAT n = 11, HH n = 4) while 7 children were treated for oncological purposes. Lesions were cortical in the insula (n = 8), mediotemporobasal (n = 8) and paracentral (n = 6) regions or subcortical (hypothalamus and basal ganglia n = 6, mesencephalon n = 4). Perioperative transient adverse events occurred in 25.7% and persistent neurological deficit was noted in 2 children. After a mean follow up of 31.2 months, 67.9% of the patients are seizure free and tumoral recurrence was observed in 3/18 cases.

[CONCLUSION] In this pediatric cohort of 35 children with challenging brain lesions, LITT ablation was safe and efficient.