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Figure 1
Panoramic plain film showing a well-circumscribed, interradicular radiolucency with associated root resorption visualized on teeth nos. 27, 28, 29, and 30. Bilateral antral pseudocysts can be appreciated in the maxillary sinuses.
Figure 2
Maxillofacial computed tomography scan with contrast. A. Axial view showing buccolingual expansion. B. Sagittal view showing root displacement. An antral pseudocyst is well visualized on the floor of the maxillary right sinus.
Figure 3
A. Microscopic examination revealed a cyst lined by odontogenic epithelium that showed a basal layer of columnar cells with hyperchromatic nuclei that showed reverse polarity. The tumor cells projected into the lumen (L) of the cyst. Similar tumor islands (star) were seen within the cyst wall (W) (hematoxylin-eosin stain, original magnification ×20). B. On high-power magnification, columnar cells showing reverse polarization are apparent (hematoxylin-eosin stain, original magnification ×200).
An 18-year-old man in good overall health was seen by his general dentist with an expansile, radiolucent lesion of the right posterior mandible. The patient stated that he noticed a right-sided facial swelling, which he described as “growing rapidly,” over the past week (although the exact duration of the lesion was unknown). He was unaware of any facial asymmetry or fullness before the past week, and he denied any associated pain or discomfort. Intraorally, the mandibular right gingiva showed buccal and lingual cortical expansion in the area of the first and second premolars (teeth nos.
