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Myositis ossificans comprises two syndromes characterized by heterotopic ossification (calcification) of muscle. ==Classification== * In the first, and by far most common type, ''nonhereditary myositis ossificans'' (commonly referred to simply as "myositis ossificans", as in the remainder of this article), calcifications occur at the site of injured muscle, most commonly in the arms or in the quadriceps of the thighs. * * The term ''myositis ossificans traumatica'' is sometimes used when the condition is due to trauma. Also Myositis ossificans circumscripta is another synonym of myositis ossificans traumatica refers to the new extraosseous bone that appears after trauma.〔(【引用サイトリンク】first1=D. )〕 * The second condition, ''myositis ossificans 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 most often attributed to a spontaneous genetic mutation upon conception. Most (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 month after injury, while the denser opacities eventually seen may not be apparent until two months have passed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Myositis ossificans」の詳細全文を読む スポンサード リンク
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