Objective: to find out the variation and grading of the maxillary sinus using computed tomography (CT) that were not antecedently published. Methods: This study was carried on 110 paranasal CT scans (220 sides). Axial images were acquired with multiplanar reformates to obtain delicate details in coronal and sagittal planes for all subjects. Results: Within 110 CTs (220 sides), the floor of the maxillary sinus was found to be 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 wall of the maxillary sinus was found to be 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 found to be 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 floor of the maxillary sinus in 22.7%, lateral maxillary wall in 16%, and at floor of orbit (maxillary roof) at 30%. Conclusion: This study improves surgeons' awareness of maxillary sinus variations building up new classifications and details for usage and communication in the ORL and endoscopic field and can be of help to residents in training. .