Extraskeletal bone formations within the soft tissues can be the presentation of benign self-limited ossifying processes such as heterotopic ossification (HO) or malignant neoplasms such as extraskeletal osteosarcomas. Depending on the involved tissue, a number of synonymous terms have been established to describe these lesions. Myositis ossificans (MO) is the most common and refers to benign b...

Yoshiki FUJISAWA, Kaichi KIDA, Hiroshi MATSUDA Department of Pediatrics Ehime University School of Medicine Ehime, Japan Tasuo SHIMIZU, Makoto MINO Department of Pediatrics Osaka Medical College Osaka, Japan Tadashi KIMAN Koriyama Ryoikuen Fukushima, Japan Shozo WATANABE Department of Orthopedics Anjo Kosei Hospital Aichi, Japan Yukiyoshi KAWAGUCHI Nagasaki Prefectural Seishi Ryoikuen Nagasaki,...

Myositis ossificans circumscripta (MOC) is a kind of self-localized, benign and tumor-like lesions often seen in adults, with approximately 75% of cases caused by trauma. We reported a case of non-traumatic MOC occurred at the elbow joint in a 9-year old child and it has been excised by surgery. After 18 months follow-up, a favorable outcome has been achieved with the Broberg-Morrey score of 10...