Hi, thanks for writing to HCM.
MYOSITIS OSSIFICATION in your case is a strong possibility. The points that favour this diagnosis in your case are
* History of blunt trauma
* formation of a large hematoma
after the injury
* Palpable HARD mass in the injured site after few months
ONE IMPORTANT POINT TO MENTION HERE- WHEN AN XRAY IS TAKEN, A MYOSITIS MASS MOST OFTEN RESEMBLES "OSTEOSARCOMA" (malignant bone tumour) IN APPEARANCE. So a history of previous trauma always indicates myositis ossificans
and not osteosarcoma.
No treatment is generally needed if the myositis mass is not painful or is not causing obstruction to the joint movements.
The standard teaching is that myositis mass should not be resected untill a MATURE bone is formed which usually takes around 18-24 months. So this should never be removed within 2 years of formation as it tends to recur in the same place again.
After excision of the myositis mass, recurrence is prevented by giving INDOMETHACIN
75MG daily for 6 weeks post operatively or radiation
of 750 Gy locally.
Hope this information is helpful. Good day