Polymyositis
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Polymyositis (PM) refers a rare autoimmune (at times considered paraneoplastic) inflammatory myositis. It is considered a form of idiopathic inflammatory myopathy. The condition is closely related to dermatomyositis and the term “polymyositis” is applied when the condition spares the skin.
Epidemiology
There are several form of the disease. The most common form affects whose in their fourth decade. There is a recognoised female predilection F:M of around 2:1.
Radiographic features
Muscle involvement usually has a symmetrical distribution (not always).
MRI
-
T2/STIR:
- affectedaffected regions are high signal reflecting muscle oedema.
Other described features include 3
- fatty infiltration around muscles
- calcification around muscles
PrognosisTreatment and prognosis
ItThis condition usually tends to be progressive.
Differential diagnosis
On MRI asthere is a broad differential - consider:
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-<p><strong>Polymyositis (PM)</strong> refers a rare autoimmune (at times considered paraneoplastic) inflammatory myositis. It is considered a form of <a href="/articles/idiopathic-inflammatory-myopathy">idiopathic inflammatory myopathy</a>. The condition is closely related to <a title="Dermatomyositis" href="/articles/dermatomyositis">dermatomyositis</a> and the term “polymyositis” is applied when the condition spares the skin.</p><h4>Epidemiology</h4><p>There are several form of the disease. The most common form affects whose in their fourth decade. There is a recognoised female predilection F:M of around 2:1.</p><h4>Radiographic features</h4><p>Muscle involvement usually has a symmetrical distribution (not always).</p><h5>MRI</h5><ul><li>-<strong>T2/STIR</strong> - affected regions are high signal reflecting muscle oedema.</li></ul><p>Other described features include <sup>3</sup></p><ul>- +<p><strong>Polymyositis (PM)</strong> refers a rare autoimmune (at times considered paraneoplastic) inflammatory myositis. It is considered a form of <a href="/articles/idiopathic-inflammatory-myopathy">idiopathic inflammatory myopathy</a>. The condition is closely related to <a href="/articles/dermatomyositis">dermatomyositis</a> and the term “polymyositis” is applied when the condition spares the skin.</p><h4>Epidemiology</h4><p>There are several form of the disease. The most common form affects whose in their fourth decade. There is a recognoised female predilection F:M of around 2:1.</p><h4>Radiographic features</h4><p>Muscle involvement usually has a symmetrical distribution (not always).</p><h5>MRI</h5><ul><li>
- +<strong>T2/STIR:</strong> affected regions are high signal reflecting muscle oedema</li></ul><p>Other described features include <sup>3</sup></p><ul>
-</ul><h4>Prognosis</h4><p>It condition usually tends to be progressive.</p><h4>Differential diagnosis</h4><p>On MRI as a broad differential - consider</p><ul><li><a title="Differential diagnosis of skeletal muscle oedema on MRI" href="/articles/differential-diagnosis-of-skeletal-muscle-oedema-on-mri">differential diagnosis of skeletal muscle oedema on MRI</a></li></ul><p> </p><p><br>Article being written - feel free to upgrade</p>- +</ul><h4>Treatment and prognosis</h4><p>This condition usually tends to be progressive.</p><h4>Differential diagnosis</h4><p>On MRI there is a broad differential:</p><ul><li><a href="/articles/differential-diagnosis-of-skeletal-muscle-oedema-on-mri">differential diagnosis of skeletal muscle oedema on MRI</a></li></ul>
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