Concha bullosa, nasal septal deviation and paranasal sinusitis; a computed tomographic evaluation.

PROBLEMS/OBJECTIVES: Although concha bullosa, nasal septal deviation (NSD) and paranasal sinusitis are apparently three independent entities, some studies suggest that they are interconnected. Computed tomography (CT) is a useful and accurate imaging modality for examining this interconnection. The objective of this study is to use CT imaging to investigate the possible association between concha bullosa, NSD and paranasal sinusitis. METHODOLOGY: We reviewed 206 nasal and paranasal CT images of individuals with sinonasal symptoms/cosmetic issues and investigated the association between the presence of concha bullosa and NSD with paranasal sinusitis. RESULTS: There was no significant relation between the presence of concha bullosa and paranasal sinusitis. The mean NSD was significantly higher in the cases with frontal, maxillary, ethmoid and sphenoid sinusitis than in unaffected subjects. Similar findings were found in the patients with any involved paranasal sinus and the controls (6.49 +/- 3.060 vs. 3.31 +/- 1.99 degrees; p<0.001). An NSD > or =3.5% differentiated between the presence and absence of paranasal sinusitis, with a sensitivity and specificity of 77.8% and 76.5%, respectively. A significant positive correlation was found between NSD and the number of involved sinuses (Pearson's r=0.58, p<0.001). The laterality of sinusitis was not associated with NSD or concha bullosa. CONCLUSIONS: Nasal septal deviation, but possibly not concha bullosa, is associated with paranasal sinusitis and its extent. An NSD > or = 3.5 degrees is a useful predictor of paranasal sinusitis.