myositis fibrosa

myositis /myo·si·tis/ (mi″o-si´tis) inflammation of a voluntary muscle.

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myositis fibro´sa  a type in which connective tissue forms within the muscle.

inclusion body myositis  a progressive inflammatory myopathy primarily involving muscles of the pelvic region and legs.

multiple myositis  polymyositis.

myositis ossi´ficans  myositis marked by bony deposits or by ossification of muscle.

proliferative myositis  a benign, rapidly growing, reactive, nodular lesion similar to nodular fasciitis, but characterized by fibroblast proliferation within skeletal muscle.

trichinous myositis  that due to the presence of Trichinella spiralis.

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myositis fi·bro·sa (f-brs)

n.

The induration of a muscle through an interstitial growth of fibrous tissue. Also called myofascitis.

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myositis fibrosa,

an uncommon inflammation of the muscles, characterized by abnormal formation of connective tissue. Also called interstitial myositis. See also myositis.

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myositis

inflammation of a voluntary muscle. Causes heat, swelling, pain and lameness if a limb is affected. Trauma is the common cause, especially in racing and work horses. Blackleg is a specific myositis. See also polymyositis.

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atrophic myositis

a form of masticatory myositis in dogs. There is a chronic, progressive atrophy and fibrosis of the masticatory muscles of dogs which finally makes it impossible for the mouth to be opened wider than a few inches.

eosinophilic myositis

1. a form of masticatory myositis seen in German shepherd dogs. It is acute, often recurrent, and there is painful, bilaterally symmetrical swelling of the masticatory muscles, mainly temporals and masseters. Often there is an eosinophilia found in the hemogram. Occasionally other muscles are also involved. There is a progressive atrophy and fibrosis of the muscles, frequently resulting in an inability to open the mouth. In the latter it may be confused clinically with atrophic myositis (above).

2. a lesion found at meat inspection. It reduces the value of the carcass. The cause is unknown.

familial myositis

see canine familial dermatomyositis.

myositis fibrosa

a type in which there is formation of connective tissue in the muscle.

masticatory myositis

see atrophic myositis and eosinophilic myositis (above).

maxillary myositis

a slowly developing myogenic degeneration of the muscles of the jaw in horses.

multiple myositis

polymyositis.

myositis ossificans

a generalized myositis with dystrophic ossification in muscle. It occurs in pigs, in which it may be familial, and rarely in dogs and cats.

trichinous myositis

caused by the presence of Trichinella spiralis.