inclusion body myositis

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inclusion body myositis

a slowly progressive inflammatory myopathy with a male predominance and preferential weakness onset in the quadriceps muscles, finger flexors, or pharyngeal muscles. Inflammatory infiltrate can be observed, with a predominance of CD8+ T cells.

inclusion body myositis

A type of idiopathic myositis that is not autoimmune and does not respond to immunosuppressive therapy, a clinical diagnosis of exclusion, confirmed by typical histologic features Clinical Slowly progressive disease of middle-aged ♂, beginning in legs, causing atrophy and weakness of quadriceps, sparing facial and oropharyngeal muscles EMG Abnormal electrical 'irritation', slowing of nerve conduction and ↑ wave amplitude
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of Southern California) compile 16 articles on muscle aging and sporadic inclusion-body myositis, as well as hereditary inclusion-body myopathies.
Rheumatology: recommends proceeding with muscle biopsy to differentiate polymyositis and inclusion-body myositis
Inclusion-body myositis is often misdiagnosed as polymyositis or dermatomyositis until identified by muscle biopsy findings (see How inflammatory myopathies develop), although suspicion is raised with a poor response to steroid therapy.
(13) The risk was highest in dermatomyositis (standardized incidence ratio [SIR] 6.2), next highest in inclusion-body myositis (SIR 2.4), and lowest in polymyositis (SIR 2.0).
(14) The most prevalent MSA, anti-Jo, is present in only about 20% of cases and correlates with interstitial lung disease, but has uncertain usefulness in differentiating between dermatomyositis, polymyositis, and inclusion-body myositis. (6,10,11,14,15)