Fig. 17
From: Flying through congested airspaces: imaging of chronic rhinosinusitis
Odontogenic sinusitis. A large area of bone resorption is seen in the alveolar ridge, around the root of a molar tooth; the floor of the maxillary sinus is interrupted, the sinus filled by inflammatory material. The small calcifications found along the ethmoid infundibulum and in the anterior ethmoid (arrows) were proven to be bone fragments, possibly transported by mucociliary clearance