A 50 year-old male presented with a large asymptomatic radiolucency associated with tooth #18. Tooth #18 had root canal therapy completed 2 years ago by his general dentist. The root canal appeared to be completed very well. Bone loss was apparent at the apex of both roots progressing up the mesial root. Periodontal probing was within normal limits. In addition, there was a long post in the distal canal.
Differential diagnosis: 1) Vertical root fracture 2) Failing root canal
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