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A dentigerous cyst arising in the bony maxilla outside of the antrum is, by definition, an extra-antral lesion.
1) A dentigerous cyst occurs in conjunction with the crown of an unerupted tooth.
We report a case of dentigerous cyst of the maxilla and maxillary sinus that caused the ectopic displacement of an unerupted tooth into the orbital rim and floor.
Dentigerous cyst in the maxillary sinus: A rare cause of nasolacrimal obstruction.
However, findings on computed tomography (CT) were compatible with a dentigerous cyst in the left maxillary sinus (figure 1).
The differential diagnosis should include periapical abscess, dentigerous cyst, and nasal furuncle.
Followup evaluations to monitor recurrence and the possibility of a malignant transformation of a dentigerous cyst is necessary.
Although unnecessary for diagnosis, there is a high Ki-67 and p53 expression in the neoplastic cells, ft is important to separate KCOTs from dentigerous cysts, orthokeratinized odontogenic cysts, and periapical cysts, as these other entities do not have the same potential for recurrence or syndrome association.