"It's common, particularly during cold and flu season." That's because the roots of the upper molars are close to the maxillary sinuses, the pair of sinus cavities located behind the cheekbone.

Aspergillus is the primary causative organism. It usually involves a single sinus, most often the maxillary sinus. [19] Presentation is typically an incidental finding on the CT scan of the head ...

The conventional (or plain film) examination usually consists of Water's, Caldwell's lateral, and basal views of the sinuses. These give excellent visualization of the frontal and maxillary ...