Usefulness of ultrasonography for early recurrent myositis ossificans

Myositis ossificans is a benign heterotopic ossifying condition of soft tissues. The lesion may cause persistent func¬tional impairment of adjacent joints. Surgical intervention is often needed to regain normal function, even though a high recurrence rate is reported. In the present case, we found that recurrent myositis ossificans could not be demonstrated by radiography during the early stage. However, ultrasono-graphy proved to be an excellent tool for detecting early recurrence of myositis ossificans and for distinguishing the condition from extraosseous sarcomas.