Definition: Generalized thickening of the mucosa of the paranasal sinuses.
Location: Any or all of the paranasal sinuses.
Edge: Well-defined to well-localized.
Shape: On 2-D and 3-D images, this will appear as a band that follows the borders of the sinus. On 3-D images, it can also appear as partial or complete opacification of the maxillary sinus.
Number: May occur in only one sinus or multiple sinuses.
(arrows pointing to radiopaque band in maxillary sinus that follows the border of the sinus)
Right maxillary sinus
Cone Beam CT – axial slice
(Note complete opacification of right maxillary sinus compared to left maxillary sinus)
Case of the week