International Session 2　　Audiology 1

Background: Endoscopic endonasal skull base surgery requires precise maneuvers in the deep nasal cavity.Collaborative surgeries with Neurosurgery revealed greater physical constraints in GHoma cases compared to PitNET cases.Objective: To compare nasal cavity structures in GHoma and PitNET cases and identify anatomical features impacting surgical maneuverability in GHoma.Methods: CT images from 28 GHoma and 104 PitNET cases undergoing endoscopic surgery were analyzed between August 2018 and April 2024.Measurements included distances between key nasal and skull base structures.Statistical analysis was conducted using t-tests.Results: GHoma cases showed longer distances from the nasolacrimal duct openings, piriform aperture edges, and anterior nasal spine to the sella turcica.Intercarotid artery distances were narrower in GHoma cases, with no significant differences in vertical-to-horizontal ratios.Conclusion: Longer nasal distances and narrower intercarotid arteries in GHoma cases may contribute to reduced surgical maneuverability compared to PitNET cases.