Dentigerous Cyst — NDEB AFK MCQ

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EasyOral PathologyDentigerous CystNDEB AFK

A panoramic radiograph of a 16-year-old shows a well-defined unilocular radiolucency surrounding the crown of an unerupted mandibular third molar. What is the most likely diagnosis?

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Correct answer: E — Dentigerous cyst

A well-defined unilocular radiolucency attached at the cementoenamel junction of an unerupted tooth is the classic radiographic presentation of a dentigerous (follicular) cyst. It arises from proliferation of the reduced enamel epithelium after enamel formation is complete. The mandibular third molar is the most common location. Ameloblastoma typically presents in older patients with a multilocular 'soap bubble' appearance.

Reference: Neville – Oral and Maxillofacial Pathology, 4th ed., 2016