Which radiographic finding is characteristically associated with a vertical root fracture?

A vertical root fracture (VRF) produces a characteristic 'J-shaped' or 'halo' periapical radiolucency on radiographs. This distinctive shape results from bone loss along the lateral aspect of the root (adjacent to the fracture line) combined with the periapical component, creating an elongated radiolucency running along the side and apex of the root. This is in contrast to typical periapical pathology (circular radiolucency at the apex only). Clinical signs include a narrow isolated periodontal pocket, sinus tract along the lateral root surface, and pain on biting. Definitive diagnosis often requires CBCT.