PATHOLOGY

Detailed explanation-1: -Usually, myositis ossificans develops after a traumatic injury. Most often, it affects large muscles, such as in your arms or legs. When bone forms where it shouldn’t, you may develop a painful, tender lump. Myositis ossificans that develops after an injury is the most common type of heterotopic ossification.

Detailed explanation-2: -Non-traumatic myositis ossificans is benign heterotropic ossification characterized by the aberrant formation of bone in extraskeletal soft tissues. It is usually confined to a single muscle or muscle group, most commonly in quadriceps, gluteals, small muscles of hand and brachialis.

Detailed explanation-3: -Myositis ossificans is a benign disorder of heterotopic bone formation occurring in response to soft tissue trauma. It most commonly presents in young adults and children as a painful, enlarging mass of the arm or thigh.

Detailed explanation-4: -The typical radiographic appearance of myositis ossificans is circumferential calcification with a lucent center and a radiolucent cleft (string sign) that separates the lesion from the cortex of the adjacent bone.