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Myositis ossificans comprises two syndromes characterized by heterotopic ossification (calcification) of muscle. In 2020, the World Health Organization classified myositis ossificans together with fibro-osseous pseudotumor of digits as a single specific entity in the category of fibroblastic and myofibroblastic tumors .
Fibrodysplasia ossificans progressiva (/ ˌ f aɪ b r oʊ d ɪ ˈ s p l eɪ ʒ (i) ə ɒ ˈ s ɪ f ɪ k æ n z p r ə ˈ ɡ r ɛ s ɪ v ə /; [1] abbr. FOP), also called Münchmeyer disease or formerly myositis ossificans progressiva, is an extremely rare connective tissue disease in which fibrous connective tissue such as muscle, tendons, and ligaments turn into bone tissue (ossification).
In traumatic heterotopic ossification (traumatic myositis ossificans), the patient may complain of a warm, tender, firm swelling in a muscle and decreased range of motion in the joint served by the muscle involved. There is often a history of a blow or other trauma to the area a few weeks to a few months earlier.
Compounding the situation was the fact that Neely developed myositis ossificans in the injured area. The injury kept him out of all but 22 games of the next two seasons, and he would only play a total of 162 NHL games for the remainder of his career after the hit because of knee trouble. [3]
Myositis is a rarely-encountered medical condition characterized by inflammation affecting the muscles. [2] The manifestations of this condition may include skin issues, muscle weakness , and the potential involvement of other organs. [ 3 ]
Proliferative fasciitis and proliferative myositis (PF/PM) are rare benign soft tissue lesions (i.e. a damaged or unspecified abnormal change in a tissue) that increase in size over several weeks and often regress over the ensuing 1–3 months. [1] The lesions in PF/PM are typically obvious tumors or swellings.
Proliferative fasciitis and proliferative myositis, originally considered separate entities, are now considered to differ only in the tissues involved. [4] Myositis ossificans and fibro-osseous pseudotumor of digits, previously considered separate but similar tumors, are reclassified as being virtually identical neoplastic bone-forming tumors. [3]
Fibrodysplasia ossificans progressiva (formerly known as myositis ossificans progressiva) General Episodic inflammatory flare-ups involving skeletal muscle (myositis) secondary to muscle tissue turning into bone (ossification) [10] [17] Non-hereditary myositis ossificans: General