Canalis sinuosus mimicking root resorption lesion
Anatomical variations in the premaxillary region, especially those involving neurovascular structures, can present a diagnostic challenge to a clinician.

Correct diagnosis is crucial for treatment decision-making and prognosis assessment of nonsurgical and surgical procedures. Canalis sinuosus (CS) is an anatomical variation of the anterior superior alveolar nerve canal.

Its diagnosis may sometimes be confusing, resulting in an inadequate treatment plan. Published in the recent issue of the journal Endodontology, the authors describe is a case of a CS mimicking an external root resorption lesion. Cone beam computed tomography (CBCT) assisted in confirming the final diagnosis.

A 50-year-old male was referred for endodontic treatment of a maxillary left central incisor. Medical history was noncontributory. Extra- and intra-oral examinations were normal. The patient reported no history of orthodontic treatment or previous trauma to the region.

Clinically, the crown of the maxillary left central incisor showed discoloration and presence of an old facial and mesioincisal composite restoration. The tooth was not tender to palpation or percussion and was not sensitive upon biting. The pulp was not responsive to thermal and electric tests. Radiographically, periapical radiolucency was evident.

In addition, the junction of the mid-third and apical third of the root showed a well-defined, circular radiolucent area that shifted in position following change of the horizontal radiographic angulation. The root canal contour could be traced without interruptions or irregularities. The horizontal bone height and density appeared normal.

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