Endodontics · patient case question
What does a J-shaped radiolucency indicate?
Patient case: J-shaped radiolucency
Scenario: A tooth with a J-SHAPED (halo) radiolucency.
Show answer and explanation
Correct answer: D. Vertical root fracture
- A. A periapical cyst produces a well-circumscribed radiolucency centred on the APEX; it does not extend up the lateral root surface as a continuous halo.
- B. A lateral periodontal cyst is a well-defined lucency BETWEEN the roots of vital teeth, most often in the mandibular canine/premolar region, and is unrelated to fracture.
- C. Condensing osteitis is a RADIOPACITY — a localised sclerotic bone reaction to low-grade pulpal inflammation, typically at a mandibular molar.
- D. Correct. A 'J-shaped' or 'halo' radiolucency that wraps from the apex up along the LATERAL surface of the root is the classic radiographic sign of a VERTICAL ROOT FRACTURE. It reflects bone loss along the entire length of the fracture line rather than a lesion confined to the apex.
Note: The clinical companion signs recorded elsewhere in this file: pain on biting plus a deep, NARROW, isolated probing defect (e.g. 9 mm on the distal only) — a solitary narrow pocket next to an otherwise healthy sulcus is a vertical root fracture until proven otherwise.