AOT Radiology — MFDS Part 1 MCQ

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ModerateOral PathologyAOT RadiologyMFDS Part 1

Which benign odontogenic tumour most characteristically presents in a young patient as a well-defined unilocular radiolucency surrounding an unerupted maxillary canine, often extending apically beyond the cementoenamel junction to enclose part of the root, with numerous fine dispersed radiopaque foci?

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Correct answer: C — Adenomatoid odontogenic tumour

The answer is **A, adenomatoid odontogenic tumour (AOT)**. Follicular AOT typically occurs in a young patient, most often in the anterior maxilla, and surrounds an unerupted canine. Unlike a dentigerous-type lesion confined to the crown, it may extend beyond the cementoenamel junction and enclose part or all of the root. Fine dispersed or clustered calcified foci produce a flocculent or snowflake-like appearance. Ameloblastoma and ameloblastic fibroma can be associated with unerupted teeth but usually lack these fine calcifications. Odontogenic myxoma more often has a multilocular, trabeculated appearance. Cementoblastoma is a predominantly radiopaque mass fused to a tooth root. The original term 'driven-snow' was removed because it is more conventionally associated with calcifying epithelial odontogenic tumour.

Reference: Chindasombatjaroen J, Poomsawat S, Kakimoto N, Shimamoto H. Calcifying cystic odontogenic tumor and adenomatoid odontogenic tumor: radiographic evaluation. Oral Surg Oral Med Oral Pathol Oral Radiol. 2012;114(6):796-803. https://pubmed.ncbi.nlm.nih.gov/23159119/