Abstract
Traumatic myositis ossificans or myositis ossificans traumatica (MOT) is a heterotopic bone formation within a muscle (or group of muscles) and soft tissues. It occurs usually in deep muscles. Maxillofacial muscles including muscles of mastication are rarely affected. We report a lesion in a 49-year-old lady with a chief complaint of pain and some limitation in mouth opening and a history of trauma. Radiological examination using CBCT shows TMJ osteoarthritic changes and a lesion in the area of medial pterygoid muscle, which was diagnosed as MOT and managed conservatively.