Chronic apical periodontitis can drain through a sinus tract, which may be intra-oral or extra-oral, though an intra-oral drainage is more common. Though such cases can be treated in a single visit, there is no report on a single visit endodontic treatment for a chronic apical periodontitis with a draining sinus. This case report demonstrates that the apical periodontitis with a cutaneous sinus tract can be successfully treated endodontically as a single visit procedure, if the patient is in good systemic health.

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