Background and objectives:The study was done to evaluate the role of computed tomography (CT) of Paranasal sinuses to determine the background prevalence of bony anatomical variations and mucosal abnormalities of paranasal sinuses in clinically suspected cases of sinusitis.The information provided by the preoperative CT Scan paranasal sinus (PNS) coronal view acts as a road map for the patients undergoing for functional endoscopic sinus surgery (FESS) to reduce the complications during surgeries and thus reducing morbidity and mortality of patients The study was conducted on 60 cases attending CT section of Radiodiagnosis Department of Rajindra Hospital, Patiala. Materials And Methods:The study was conducted on 60 cases over a period 3 years from 2010 to 2013 irrespective of gender and age group. Selection of patients were based on clinical features like nasal or post nasal discharge, nasal obstruction, headache, anosmia, cough and hoarseness of voice. Relevant history, clinical examination and noncontrast CT Scan of paranasal sinuses (PNS) was performed of every patient in Coronal view complemented by Axial view . Results: It was observed that multi anatomical variations were more as compared to single anatomical variations. In our study deviated nasal septum was the most common finding seen in 46% of cases followed by concha bullosa, uncinate process variations, onodi cells, haller cells and agger nasi cells. Conclusion: Evaluation of CT Scan PNS concluded that deviated nasal septum and anatomical variations at lateral wall of nose causes narrowing of osteomeatal complex area which predisposes to sinusitis in the patients.