[Multilocular myositis ossificans--damage caused by excessive stress in performance sports?]

This is a report of a girl of 16 years of age who complained of pain in both legs after intensive competitive sports, the main event being the 800 m race. Radiologically visualised were periostal reactions and new periostal bone formations at the femur and lower leg. Diagnosis was extremely difficult due to generalised signs and symptoms, such as temperature, associated with inappetence and a "run-down" feeling, increase of alkaline phosphatase and liver enzyme levels and of the blood sedimentation rate. Differential diagnosis of heterotopic ossifications is dealt with in detail.