Cone Beam Computed Tomography Analysis of Sphenoid Sinus Pneumatization and Relationship with Neurovascular Structures.

Background: The sphenoid sinus is considered as the most variable pneumatized structure of the skull.

Purpose: The aim of the present study was to determine the prevalence of the Onodi cell as well as to evaluate the relationship between the sphenoid sinus type of pneumatization and the presence of surrounding neurovascular protrusion using cone beam computed tomography (CBCT).

Methods: The CBCT images of 500 patients/996 sides [203 males (40.