Anatomical variations of sphenoid sinus in terms of volume and protrusions of optic nerve/internal carotid artery in a subgroup of Pakistani population.

Objective: To compare the volume of sphenoid sinus with protrusions of optic nerve and internal carotid artery in both males and females.

Methods: The cross-sectional study was conducted from October 2020 to February 2021 at the Radiology Department of Dow University of Health Sciences, Karachi, and comprised males and females aged 20-60 years having no sphenoid sinus bony abnormality. Sphenoid volume and optic nerve and internal carotid artery protrusions were examined in the computed tomography scans of the paranasal sinus.