Objectives: The aim of this study was to determine the incidence of agger nasi and frontal cells in a Turkish population and their relation to frontal sinusitis. Methods: A total of 412 non-contrast paranasal sinus computed tomography (CT) images taken between March 2017 and June 2018 were examined retrospectively. Frontal cells were classified into four types according to Kuhn’s classification. The relation of agger nasi and frontal cells to frontal sinusitis was evaluated. Results: Of the 412 patients, 202 were males (mean age 34.8±14.9) and 210 were females (mean age 35.1±13.9). agger nasi cell was detected in 214 (51.9%), and frontal cell in 198 patients (48%). Frontal sinusitis was detected in 68 patients (16.5%). According to Kuhn’s classification, Type 1 frontal cell was detected most frequently. A significant relationship was observed between the presence of agger nasi and frontal cells and frontal sinusitis (p
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