Abstract

AİM: Skull base composition and the mean height of structures during endoscopic sinus surgery seems to be very important to prevent severe intraoperative complications. In this study, the skull base composition, anatomic variations and the effect of chronic rhinosinusitis and / or nasal polyposis on these measurements have been evaluated. MATERIAL AND METHOD: We studied preoperative coronal CT seans of 96 patients prior the endoscopic sinüs surgery. All of them had no previous rhinologic surgery or trauma history. The patients were classifıed as follows: patients with nasal polyposis (n= 29), patients with chronic rhinosinusitis (n=67). Distance between ethmoid roof and eribriform plate, and distance between etmoid roof and nasal floor were measured, asymmetry was recorded. FINDINGS: 10.4 percent of cases were Keros type 1, 71.9 % Keros type 2 and 17.7 % Keros type 3. CONCLUSION: There was no statistically significant difference among two groups regarding to Keros types of classifıcations.