Evaluation of anatomical variants of sphenoid sinus by multidetector computed tomography

Background: Para nasal sinuses are air-filled cavities present in facial bones. Sinusitis is a common medical problem affecting millions of people annually. CT screening paranasal has the advantages showing bony details and good soft tissue outlines. valuable identification variations pneumatisation sphenoid characterization prior to FESS trans-sphenoidal surgeries. Materials Methods: This was cross-sectional study conducted at Dr. PSIMS & RF, Chinnavutapalli. done on SIEMENS SOMATOM EMOTION 16 slice spiral machine. We included total 100 patients clinically diagnosed with chronic sinusitis, who were referred for scan PNS our hospital. Results: Out patients, 52 males 48 females. Most 20-30 years age group comprising 55% population. Presellar type found (83%), Postsellar (11%). Pneumatisation pterygoid process (42%), anterior clinoid (28%), greater wing (22%). Bilateral protrusion internal carotid artery (19 cases), right side (5 cases) left (3 cases). Protrusion optic nerve noted 21 cases, among these 14 bilaterally, (4) N (3) side, maxillary (16 8 (bilaterally), (5) Vidian (20 (8) (7) side. Conclusion: Computed Tomography plays an important role visualization variation sinus its patterns re-emphasized concept that especially region key factor causation accidental damage vital structures like ICA, Optic nerve, Maxillary nerve.