Fig. 4

A Exposed the petrous bone; B removed the petrous bone and destroyed the bone of the sloping area; C, D entered the cavernous sinus and removed the tumor inside; E the tumor invaded the bottom of the pituitary fossa dura mater, and scraped the inside of the pituitary fossa with a scraper; F removed most of the tumor in the slope area, probed around, and scraped until normal bone with a hard texture was reached; G, H the tumor was removed entirely, exposing the bottom of the pituitary fossa, the slope area, and the internal carotid artery on both sides