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The cyst obstructed the osteomeatal complex and produced maxillary sinus opacification on CT.
Computed tomography (CT) of the paranasal sinuses revealed the presence of an aberrant tooth--presumably a third molar--that was obstructing the left osteomeatal complex and bulging into the ethmoid infundibulum (figure 1).
1-4) However, the primary difference between these other cases and ours is that our patient experienced an obstruction of the osteomeatal complex, which dictated an alternative surgical approach.
Obstruction of maxillary sinus ventilation at the osteomeatal complex is accepted as a pathologic precursor for the development of acute and chronic sinusitis.
The characteristic CT findings in patients with hypoplastic or atelectatic maxillary sinus include osteomeatal complex obstruction, a C-shaped lateral bowing of the uncinate process, sinus opacification, and internal bowing of the posterolateral, superior, and medial walls of the sinus.