It was associated with a mucus retention cyst in the right maxillary sinus and mucosal hyperplasia in the floor of the left maxillary sinus, the authors noted. CBCT images in coronal (A), axial (B), ...

This appears on examination as an epithelial-lined cyst of mucus. It is less common, and is more likely to be seen on the upper lip, hard palate, floor of the mouth, and the maxillary sinus.