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Adenomatoid odontogenic tumour (AOT) is an odontogenic tumour that occurs only in the tooth-bearing area of the jaws. The tumour is unique in that most of them occur in association with an unerupted maxillary cuspid in teenage girls. The tumour has minimum growth potential, and recurrence after surgical removal is rare.

Radiographically AOT presents as a well-demarcated unilocular radiolucency that generally exhibits a smooth corticated border. Most lesions are pericoronal or juxtacoronal. Radiopaque foci within the radiolucent lesion are very common. Enucleation and curettage is the treatment of choice.

Figure 1: CT scan of AOT involving the entire maxillary sinus reaching the orbital floor.
Figure 2: Unusually large maxillary AOT. Radiograph of operation specimen showing impacted third molar in an expansile osteolysis with stippled calcifications.
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