Definition: A localized thickening of the mucosa of the maxillary sinus. This is frequently seen adjacent to an area of inflammation of the maxilla or of tooth origin.
Location: Floor of maxillary sinus adjacent to an area of inflammation.
Shape: No particular shape.
Number: Maybe single or multiple depending of surrounding bone and teeth.
(arrows pointing to localized thickening of the mucosa of the maxillary sinus)