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Endodontics · single question

A radiographic/clinical lesion is described to recognize an aneurysmal bone cyst (and, separately, a simple/traumatic bone cyst). Which description matches an aneurysmal bone cyst?

  1. An expansile, 'blown-out/ballooned' radiolucent lesion filled with blood, often multilocular, of unknown cause
  2. A well-corticated lesion with displaced teeth and no expansion
  3. A periapical radiolucency around a non-vital tooth
  4. A radiopaque mass attached to a root
Show answer and explanation

Correct answer: A. An expansile, 'blown-out/ballooned' radiolucent lesion filled with blood, often multilocular, of unknown cause

An aneurysmal bone cyst is a blood-filled, expansile ('ballooned') pseudocyst that displaces and expands bone, frequently multilocular ('soap-bubble') on imaging.Other options: The other descriptions fit different entities (e.g., radicular cyst, odontoma) and not the ballooned, blood-filled aneurysmal bone cyst.Key exam takeaway: Aneurysmal bone cyst = expansile, blood-filled, ballooned multilocular radiolucency. Simple (traumatic) bone cyst = empty cavity scalloping between roots after trauma, treated by curettage to induce bleeding/healing.

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