A 44-yr-old woman was seen with an intrabony multilocular radiolucency of the posterior mandible in the area of the left first molar. A full gold crown had been placed 7 yr previously, and a periapical radiograph at that time had revealed mild sclerosis of the periapical bone. After vitality of the pulp was confirmed, endodontic therapy was performed prior to the surgical exploration of the lesion. At surgery an empty intrabony cavity was present and a clinical diagnosis of traumatic bone cyst was made. Followup at 2 yr revealed healing with marked sclerosis. This case is reported because of the unusual occurrence of the traumatic bone cyst as well as the role of endodontic treatment in its diagnosis and treatment.
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