SURG-28. THE IMPACT OF PERILESIONAL HEATSINK STRUCTURES ON ABLATION VOLUMES AND SYMMETRY IN LASER INTERSTITIAL THERMAL THERAPY FOR THE TREATMENT OF PRIMARY CENTRAL NERVOUS SYSTEM TUMORS

Abstract BACKGROUND Laser Interstitial Thermal Therapy (LITT) has emerged as a minimally invasive treatment for primary CNS tumors. While LITT offers advantages over traditional approaches, perilesional intracranial heatsinks can lead to asymmetric ablation, impacting patient outcomes. Understanding heatsink effects is crucial for optimizing LITT efficacy. METHODS We retrospectively analyzed primary CNS tumors treated with LITT at a single tertiary care center. Ablation outcomes were quantified using the Heatsink Effect Index (HEI) measured on a scale of 0-1 (0=total symmetry; 1=complete asymmetry), and extent of ablation (EOA). Heatsink types evaluated were sulci, meninges, vasculature, and cerebrospinal fluid (CSF) spaces, inclusive of ventricles, surgical resection cavities, and CSF cisterns. Statistical analyses assessed the relationship between heatsink proximity and ablation outcomes. RESULTS A total of 99 patients satisfied all selection criteria. The cohort was 53% female, with a mean age of 61 years. Glioblastoma was the most predominant tumor type (78%), followed by low grade gliomas (15%), and meningiomas (4%). Heatsink proximity significantly correlated with ablation asymmetry (HEI) (p < 0.001), particularly at the midpoint of the catheter trajectory. The correlation between closest heatsink distance and HEI varied across the different heatsink types, with distance to vasculature and CSF spaces correlating the strongest with ablation asymmetry. When assessing the relationship between EOA and medial HEI during suboptimal ablations (EOA < 100%), we demonstrated a negative correlation showing improved EOA as HEI was reduced. Optimal cutoff catheter-heatsink distances for predicting ablation asymmetry ranged from 6.6-13.0 mm, emphasizing the impact of heatsink proximity on LITT efficacy. CONCLUSION We show that proximity to heatsinks, especially within a threshold distance of 13.0mm from the laser catheter, significantly predicts ablation asymmetry and volume in the setting of primary CNS tumors. Neurosurgeons should consider heatsink effects in pre- and intraoperative planning to optimize LITT outcomes and preserve normal brain tissue.