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Figure 2. A 68-year-old woman with ONB with skull base involvement in Figure 2A-C. (A) Preoperative MRI of ONB; (B) Postoperative MRI showing complete resection with enhancing extracranial pericranial flap (arrow); (C) Intraoperative endoscopic endonasal view of dural dissection of ONB using EES techniques. FS: Frontal sinus; FL: frontal lobe; OD: olfactory dura; ONB: olfactory neuroblastoma; MRI: magnetic resonance imaging; EES: endoscopic endonasal surgery.