For Peer Review Maxillary sinus assessment: a computed tomography analysis and classification Journal: International Archives of Otorhinolaryngology Manuscript ID IAORL-2024-04-1768-OR Manuscript Type: Original Research Keywords: nose, maxillary sinus, CT Abstract: Introduction: The preoperative computed tomography (CT) characteristics of the maxillary sinus helps to preserve its anatomical and functional integrity during and after surgery. Objective: to find out the maxillary sinus variations and types using CT that were not antecedently published. Methods: This study was carried on 110 paranasal CT scans (220sides). with multiplanar reformates, axial images were obtained to get delicate details in coronal and sagittal planes for all subjects. Results: Within 110 CTs (220 sides), the maxillary sinus floor was type 1 in 53.2%, type 2 in 29.1%, and type 3 in 10%, type 4 in 7.7% with significant difference between both gender. The most common maxillary sinus floor type was type 1. The lateral maxillary sinus wall was type 1 in 32.7%, type 2 in 65%, type 3 in 2.3% with significant difference between both gender. The most common lateral wall of the maxillary sinus type was type 2. The floor of orbit was type 1 in 0.9%, type 2 in (21.3%, type 3 in 50.5%, type 4 in 27.3%.without significant difference between both gender. The most common type of orbital floor was type 3. Asymmetry was detected between right and left sides for maxillary sinus floor of in 22.7%, lateral maxillary wall in 16%, and at floor of orbit (maxillary roof) at 30%. Conclusion: The study increases surgeons' awareness of maxillary sinus variations building up new classifications and details for usage and communication in the ORL and endoscopic field and could be helpful for training