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 100.We suggest that surgical resection should be done as soon as the diagnosis is confirmed.