Polymyositis, Inclusion Body Myositis, and Related Myopathies



Polymyositis, Inclusion Body Myositis, and Related Myopathies





Polymyositis


Definition

Polymyositis: acute or subacute onset; sometimes spontaneous improvement; infiltration of muscle by lymphocytes. Occurs alone or as part of systemic disease (including collagen-vascular disease, HIV infection).


Clinical Features

Symptoms of proximal limb myopathy: difficulty climbing stairs, rising from low seats, lifting packages or dishes, working with arms overhead.

Difficulty holding head erect (“dropped head” syndrome) due to neck muscle weakness. Cranial muscles spared except for dysphagia.

Usually subacute, nadir in months. Rare before puberty. Often seen with collagen vascular diseases: systemic lupus erythematosus, rheumatoid arthritis, Sjögren disease, systemic sclerosis.

Jul 27, 2016 | Posted by in NEUROLOGY | Comments Off on Polymyositis, Inclusion Body Myositis, and Related Myopathies

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