Evaluation of paranasal sinuses and nasal cavity using CT PNS study to determine the anatomical variations in a tertiary care centre at Chengalpattu, Tamilnadu

Background: Variations in the anatomy of the paranasal sinuses and nasal cavity can significantly affect the development of sinus pathologies and the success of surgical interventions. This study aims to determine the prevalence of anatomical variants in these regions among patients visiting a tertiary care center in Chengalpattu, Tamil Nadu, utilizing CT scans of PNS for evaluation. Methods: A retrospective observational study was conducted, analyzing CT scans of 200 patients who underwent imaging for sinus-related complaints. Variants were documented and categorized. Results: Deviated nasal septum (DNS) was the most common finding (67%), followed by concha bullosa (40%), agger nasi cells (30%), Haller cells (15%), cribriform plate (15%)and paradoxical middle turbinate (10%). Detailed data on prevalence and distribution are provided in tables. Conclusion: Anatomical variations in the PNS are highly prevalent and clinically significant. CT evaluation is indispensable for preoperative planning in functional endoscopic sinus surgery (FESS) and to understand the etiology of sinonasal diseases.