Sinonasal Anatomy Variations on CT Scans of a Sample of Filipino Adults With Chronic Rhinosinusitis

ABSTRACT
 Objective: To determine the prevalence of sinonasal anatomic variations seen on paranasal sinus (PNS) CT scans a sample Filipino adults with chronic rhinosinusitis.Methods: Design: Cross-sectional study Setting: Tertiary Government Training Hospital Participants: The PNS 51 patients rhinosinusitis and without nasal polyposis diagnosed at our outpatien Department Otorhinolaryngology-Head Neck Surgery between October 2015 to December 2020 were reviewed for presence variants. identified variants was calculated.
 Results: patients, 41 (80.4%) men 10 (19.6%) women, included. median age 48 years (Q25: 35, Q75: 56, IQR:21). Lund Mackay Score (LMS) 15 12, 20, IQR:8). Majority (94%) had an LMS ≥5. most common variant in population agger nasi (n=46/51, 90.2% present bilaterally) followed by uncinate process attachment lamina papyracea (n=90/102, 88.24%). third sixth findings Keros type II classification (n=76/102, 74.51%), septal deviation (n=35/51, 68.62%), optic nerve canal 1 (n=67/102, 65.69%) anterior ethmoid artery grade (n=46/102, 45.1%), respectively. Less Onodi cell (n=13/51, 25.49% unilateral n=10/51, 19.61% bilateral), Haller (n=8/51, 15.69% n=1/51, 1.96% supraorbital (n=4/51, 7.84% n=4/51, middle turbinate concha bullosa (n=3/51, 5.88% n=6/51, 11.76% superior (n=2/51, 3.92% pneumatized crista galli 3.92%) dehiscence (n=1/51, bilateral). 
 Conclusion: In adult CRS sampled this study, six nasi, papyracea, classification, deviation, 1. Pre-operatively, scan every patient must be meticulously evaluated avoid surgical complications.