Epidemiology
A bone-forming lesion in the soft tissues, often appearing after trauma or a hematoma. The maturation of the calcification from the periphery toward the center helps distinguish it from a bone-forming sarcoma.
Basic features
Early on it can resemble a sarcoma because of the pain and the mass; the way the ossification matures from the periphery helps make the diagnosis.
Usual treatment
It is observed when the diagnosis is clear; surgery is postponed until the lesion matures if it causes pain, entrapment, or limited movement.
Outcomes and prognosis
It usually improves over time and rarely needs aggressive treatment.