multiple myositis

Also found in: Dictionary, Thesaurus, Encyclopedia.


inflammation of a voluntary muscle; called also initis.
myositis fibro´sa a type in which there is a formation of connective tissue in the muscle.
multiple myositis polymyositis.
myositis ossi´ficans myositis marked by bony deposits in muscle.
trichinous myositis that which is caused by the presence of Trichinella spiralis.

multiple myositis

mul·ti·ple my·o·si·tis

(mŭl'ti-pĕl mī'ō-sī'tis)
The occurrence of multiple foci of acute inflammation in the muscular tissue and overlying skin in various parts of the body, accompanied by fever and other signs of systemic infection.
See also: dermatomyositis


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.

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
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.

Patient discussion about multiple myositis

Q. Does my son have dermatomyositis? My son is 6 years old and he is very weak. He gets very tired after doing the simplest things like going for a walk. He also has a rash on his neck. What could this be?

A. It doesn't sound like you have anything to worry about. The main warning sign of dermatomyositis is muscle weakness. Usually the first muscles affected are in the hips and thighs, though any other muscle in the body can be affected. It may be hard to climb stairs, get dressed or get out of bed.
Pain in the joints between bones.
Deep red (almost purple) rash, usually on the face, scalp, neck and chest. However, the rash can appear on any part of the body.
Coughing and shortness of breath.
· It may also be hard to swallow.
If you have dermatomyositis you will have muscle weakness and will develop a rash, most often on your face, scalp, neck and chest. The rash can also appear on your hands and fingers (often the knuckles), elbows, knees, ankles, upper arms and thighs. The rash is often deep red in colour (almost purple) and in some areas may be slightly raised. If your son's rash doesn't look like this then it could be caused by many other things, consult your Dr about it.

More discussions about multiple myositis
Full browser ?