INTRODUCTION: Sinusitis is one of the most prevalent chronic diseases seen in the ENT clinic. It has different causal factors, and can present with a variety of clinical features. One of these causal factors of chronic sinusitis are anatomical variations of the nasal cavity and paranasal sinuses. Treatment options range from conservative to surgical, depending on the degree of clinical severity. CT scanning is one of the best non-invasive tools for investigating sinusitis patients because it is imperative to know all anatomical features relevant to the case, especially before surgery. METHODS: This was an observational, cross-sectional, retrospective analysis of CT findings of the paranasal sinuses in sinusitis patients. RESULTS: One hundred and seventy-three (80.4%) of the 215 reports analyzed showed anatomical abnormalities, such as septum deviation, aeration of the sphenoidal lateral recess and the clinoid process, Haller cells, and middle turbinate polyps, and 94% of the sample had radiographic features of sinusitis. DISCUSSION AND CONCLUSION: Women were affected by sinusitis more often than men in the studied population, and most patients were in the fourth decade of life. Maxillary sinuses were involved the most frequently, especially on the left side. Nasal septum deviation was the commonest detected anatomical variation and Haller cells were the rarest, but all of these had a statistically significant correlation with sinusitis involving the maxillary, anterior ethmoid and frontal paranasal sinuses.
