A man in his 60s was referred to our department due to a rectangular opacity near the coronoid process of the mandible detected by panoramic radiography during dental treatment for caries. CT revealed a cylindrical opacity on the lower edge of the left zygomatic bone, and the object was excised. On fluorescence X-ray analysis, the object was a metallic foreign body containing iron as the main component. In addition, the same morphological opacity was observed on a panoramic X-ray photograph taken at a nearby dental clinic 18 years ago.
