Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 4 2014 08 15 490 4 Vijayakumar Ashwinkumar Post Graduated Student, Department of Conservative Dentistry and Endodontics, Meenakshi Ammal Dental College and Hospital, India. Suresh Nandini Department of Conservative Dentistry and Endodontics, Meenakshi Ammal Dental College and Hospital, India. Natanasabapathy Velmurugan Professor, Department of Conservative Dentistry and Endodontics, Meenakshi Ammal Dental College and Hospital, India. 2015 10 16 This case report presents endodontic management of a mandibular lateral incisor with three canals using surgical dental operating microscope. This study describes the root canal variation of mandibular lateral incisor and highlights the importance of surgical operating microscope in detecting an unusual canal morphology. https://fid.tums.ac.ir/index.php/fid/article/view/404 https://fid.tums.ac.ir/index.php/fid/article/download/404/380