Abstract
We encountered a rare case of an impacted third molar at the medial side of the mandibular notch on the right side. The patient was 72-year-old female, and the impacted tooth was incidentally found by orthopantomography, which had initially been taken to investigate pericoronitis of the upper third molar on the left side. After inflammation subsided, the upper third molar on the left side was extracted. We will continue to observe the impacted tooth in the mandible on the right side, and if there is any infection, extraction may be an option.