Description of the Uncinate Process: A Computed Tomography Cross-Sectional Study

<b>Introduction</b> The uncinate process (UP) is the most important and constant landmark in the ostiomeatal complex and the middle meatus. <b>Objective</b> To identify the UP variations that have not been published before and establish a categorization using computed tomography (CT). <b>Methods</b> The current study was carried out on 110 paranasal CT scans (220 sides). Axial images were acquired with multiplanar reformats to capture delicate details in other planes. <b>Results</b> Out of 120 CT scans (220 sides), the UP was found to be of type 1 in 84.5%, type 2 in 12.3%, and type 3 in 3.2%, without significant diferences between genders, and it was found to be medialized in 81.9%, vertical in 16.3%, lateralized in 0.9%, and absent in 0.9%, without significant differences between genders. A total of 8.63% of the UPs were pneumatized. <b>Conclusion</b> The present study improves surgeons' and radiologists' knowledge of the UP, while creating a standard classification and description to be used as a common language between otorhinolaryngologists and radiologists, which could also be used for training.