A 'J-shaped' radiolucency on a periapical radiograph is most associated with:

Correct answer: A. Vertical root fracture

• A. Correct. A 'J-SHAPED' or 'halo-like' radiolucency extending from the apex ALONG THE LATERAL ASPECT of the root is classic for a VERTICAL ROOT FRACTURE. The fracture separates the root, allowing bone loss to occur on BOTH SIDES of the fractured segments, creating a bone loss pattern that follows the fracture line — resulting in the J-shaped or periradicular 'halo' radiolucency.
• B. Incorrect. Condensing osteitis is a RADIOPAQUE lesion — not a radiolucency.
• C. Incorrect. A periapical/apical cyst appears as a well-defined, round/oval radiolucency at the ROOT APEX — not J-shaped.
• D. Incorrect. A lateral periodontal cyst appears between adjacent teeth at the mid-root level — not a J-shaped apical pattern.