A. Computed tomography 6 months after CyberKnife
® treatment. Multiple extremely low density areas are shown in subarachnoid spaces and lateral ventricles, suggesting pneumocephalus. B. Endoscopic repair of cerebrospinal fluid (CSF) leakage. Left: The endoscopic appearance of subtotal tumor resection in the first surgery. Center: Endoscopic observation of the residual tumor 6 months after CyberKnife® treatment. All irradiated tissue is hypovascular and whitish, and two small holes are identified in the dura mater at the bottom of sella turcica (red circle). Right: Fat tissue was used as a patch and fixed in place with fibrin glue. Black arrows show the lateral bone of the floor of the sella turcica and black arrowheads indicate residual tumor. C. Computed tomography after repair of CSF leakage. Air had completely disappeared 2 weeks after the endoscopic repair of CSF leakage.