* In the first, and by far<unk> st common type, nonhereditary<unk>  (commonly referred to simply as<unk> ", as in the remainder of this article), calcifications occur at the site of injured muscle,<unk> st commonly in the arms or in the quadriceps of the thighs. * The term<unk>  traumatica is sometimes used when the condition is due to trauma. Also<unk>  circumscripta is another synonym of<unk>  traumatica refers to the new extraosseous bone that appears after trauma. * The second condition,<unk>  progressiva (also referred to as fibrodysplasia ossificans progressiva) is an inherited affliction, autosomal dominant pattern, in which the ossification can occur without injury, and typically grows in a predictable pattern. Although this disorder can be passed to offspring by those afflicted with FOP, it is also classified as nonhereditary, as it is<unk> st often attributed to a spontaneous genetic mutation upon conception.<unk> st (i.e. 80%) ossifications arise in the thigh or arm, and are caused by a premature return to activity after an injury. Other sites include intercostal spaces, erector spinae, pectoralis muscles, glutei, and the chest. On planar x-ray, hazy densities are sometimes noted approximately one<unk> nth after injury, while the denser opacities eventually seen may not be apparent until two<unk> nths have passed.
Myositis ossificans
Osteoma cutis
Fibrodysplasia ossificans progressiva
Leri pleonosteosis
Osteitis fibrosa cystica
Osteochondritis dissecans
Enchondromatosis
Osteofibrous dysplasia