Background: Sinonasal region is subjected to wide anatomical variation. The paranasal sinuses (PNS) create a connection with nasal cavity. They are placed in close proximity nose. four paranasalsinuses ;maxillary, ethmoid, sphenoid, and frontal, named after their coinciding bone. Computed Tomography (CT Scan )is important modality describe the location of these sinuses. Aim: To ascertain freque...