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Journal Article
Significant response to immune therapies in a case of subacute necrotizing myopathy and FKRP mutations.
Neuromuscular Disorders : NMD 2015 November
Necrotizing myopathies can be encountered in various conditions as acquired myopathies (toxic or autoimmune) or muscular dystrophies. We report a twenty-year-old Caucasian woman who presented with clinical findings suggestive of an inflammatory myopathy: subacute onset of lower limb muscle weakness, myalgia, weight loss and absence of family history. The serum creatine kinase level was elevated at 4738 IU/L (normal range, 25-175 IU/L). Muscle biopsy was consistent with necrotizing myopathy. The patient showed significant clinical improvement following corticosteroid, azathioprine and intravenous immunoglobulin treatments. Biological tests revealed no specific autoantibodies associated with necrotizing autoimmune myopathies. Immunohistochemical staining for sarcolemmal proteins in muscle biopsy samples finally led to a diagnosis of limb-girdle muscular dystrophy 2I (fukutin-related protein gene mutations). The response to immune therapies suggested a possible inflammatory component associated with the muscular dystrophy and highlighted the potential benefit of corticosteroid treatment in patients with LGMD2I and subacute onset.
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