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Intraoperative images of endoscopic endonasal decompression for a left side CS meningioma. (A) Drilling down the hyperostotic bone overlying the CS; (B) exposure of the sellar dura; (C) opening the sellar interdural space after complete decompression; (D) decompression of bone overlying the sella, medial SOF, and CS. CS, cavernous sinus; SOF, superior orbital fissure; V2, maxillary nerve.
