This is a report of two cases with an atraumatic myositis ossificans of the iliopsoas muscle, which is a rare disease.
In the first case, the iliopsoas muscle was operatively dissected since an infectious muscle desease had been suspected. However, no abscess was observed in the muscle, and no bacteriae was detected in culture. Histological examination of the muscle suggested that it was the initial stage of myositis ossificans.
In the second case, CT scanning showed an ossified lesion in the iliopsoas muscle. The lesion disappeared with conservative therapy using Uronase injection.
