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tion to the endoscopic anatomy during surgery and help predict the endonasal surgical corridor anatomy preoperatively. During endonasal endoscopic anterior skull base surgery, the area between the anterior border of the sphenoid sinus and PEA artery was safe as the first dissection zone. Preoperative radiologic width and depth measurements facilitate orientation to the endoscopic anatomy during surgery and help predict the endonasal surgical corridor anatomy preoperatively. Future climate change may adversely impact human health. The d