502 Endoscopic Versus Microsurgery Resection of Third Ventricle Colloid Cysts: A Single-center Case-series of 140 Consecutive Patients

INTRODUCTION: The resection of colloid cysts of third ventricle can be done with either open microsurgery or endoscopy with each having different cons and pros. METHODS: Data of patients who underwent surgical resection of third ventricle colloid cyst via either endoscopic or microsurgery approach by a single surgeon between 2005-2020 were retrospectively collected. After administration of criteria, 140 records were retrieved (60 through endoscopic and 80 by trans-cranial microsurgery). Clinical and surgical measures were compared between approaches after adjustment for confounders with generalized linear multivariate regression. RESULTS: Length of hospital stay, postoperative meningitis, and operation time, cyst size, and baseline comorbidities did not differ between groups. Gross total resection (GTR) was achieved for all cases in microsurgery group while in endoscopic group it was lower (90% vs 100%; p = 0.005). Intraoperative hemorrhage occurred in 14 (23.3%) of endoscopic patients while for microscopic group it was zero (p < 0.001). Post-operative shunt was required for two patients (one in endoscopic group and the other in microscopic group). Two patients had tumor recurrence, both being in endoscopic group. No mortality was detected in either group. Multivariate analyses were insignificant for the effects of clinical and demographic factors in occurrence of worse surgical outcomes (non-GTR and hemorrhage). CONCLUSIONS: Rate of intra-operative hemorrhage was higher in endoscopic method and GTR was lower, even after adjustment for other factors. This could be due to technologic shortcomings and limited space for resection maneuvers and complication management.