Symptomatic Pneumocephalus After Spinal Intradural-Extramedullary Tumor Surgery

OBJECTIVE: Durotomy is a necessary procedure for resection of spinal intradural-extramedullary (IDEM) tumor. The purpose of this study was to investigate the prevalence and clinical implications of pneumocephalus after spinal IDEM tumor surgery and also the association between pneumocephalus and postoperative headache. METHODS: This prospective study was conducted in a cohort of 20 patients who were diagnosed with a spinal IDEM tumor and underwent surgical resection. The mean patient age was 53.6 years (range, 29-75 years). Histological findings revealed schwannoma in 16 cases (80.0%) and meningioma in 4 cases (20.0%). Brain computed tomography scan was performed immediately after surgery. The prevalence and severity were analyzed based on the classification into 4 groups according to the extension of pneumocephalus: absence, mild, moderate, and severe. A visual analog scale (VAS; range 0-10) for headache was reported daily for the first postoperative week. Headache-related pneumocephalus was defined as a VAS score of >= 5 points at least once in that 1-week period. RESULTS: The prevalence of pneumocephalus was 90.0% (18 patients). Five patients (25.0%) had severe pneumocephalus extending to the extra-axial space. Seven of the 20 patients (38.9%) complained of significant headache. Five of these patients had severe pneumocephalus, 1 patient had moderate pneumocephalus, and 1 patient had moderate pneumocephalus. A statistically significant association was observed between the severity of pneumocephalus and headache (P = 0.001). CONCLUSIONS: Pneumocephalus is a common complication after spinal IDEM tumor surgery. This report is the first study to investigate the prevalence of pneumocephalus and analyze its association with headache after spine surgery. The severity of pneumocephalus was significantly related to postoperative headache.