M61.2: Paralytic calcification and ossification of muscle

Paralytic calcification and ossification of muscle, also known as Myositis ossificans, is a rare medical condition where an abnormal growth of bone develops within a muscle or other soft tissue following repeated trauma or after paralysis. It may often occur when the body's response to injury goes awry. Instead of forming scar tissue, the body creates bone, which results in rigidness and loss of flexibility, limiting movement in the affected area. Symptoms usually commence with swelling and inflammation, which progressively increases over time. Pain is also a common symptom, varying from mild discomfort to severe, depending on growth size and location. X-rays, bone scans, and other imaging tests are often used to diagnose this condition, as it can often demonstrate the newly developed bone. This condition most commonly affects the arms or legs but can develop in any muscle.