title: An endodontic failure caused by an unusual anatomical anomaly.
mesh_terms: D000328:Adult; D001047:Apicoectomy; D003786:Dental Pulp Cavity / Q000002:abnormalities*; D005260:Female; D006801:Humans; D007180:Incisor / Q000002:abnormalities; D008437:Maxilla; D011859:Radiography; D012389:Root Canal Obturation; D014092:Tooth Root / Q000002:abnormalities / Q000000981:diagnostic imaging