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(a) Representative preoperative sagittal gadolinium-enhanced T1-weighted image demonstrates the lengths of the flap and skull defect. (b) Intraoperative photograph through the endoscope demonstrates the posterior nasoseptal flap covering the skull defect. (c) In the postoperative MRI, the vascularized flap (arrows) can be visualized lining the patent sphenoid sinus. (d) Endoscopic photograph of the flap 2 years after the initial surgery
