Fig 1.

Coronal CT scans showing the definition of a concha bullosa.

A, Coronal CT scan of the paranasal sinuses shows pneumatization (arrow) of just under 50% of the vertical height of the right middle turbinate. This was not considered to be a concha bullosa in this study. There is no deviation of the nasal septum. There is inflammatory mucosal thickening obstructing the left infundibulum.

B, Coronal CT scan of the paranasal sinuses shows pneumatization (arrow) of more than 50% of the vertical height of the right middle turbinate. This pneumatization extends into the caudal bulbous portion of the turbinate. This was considered to be a small concha bullosa in this study. Also note that the nasal septum is moderately deviated convexity to the left and there is preservation of the air channel between the concha and the nasal septum. There is some mucosal thickening in both maxillary sinuses.