Polymyositis, necrotizing autoimmune myositis, myofasciitis, and overlap-myositis
Patients with polymyositis commonly present with a myopathy characterized by proximal and often symmetric muscle weakness manifested as difficulty performing tasks requiring the use of proximal muscles. Polymyositis has no unique clinical features, and its diagnosis is one of exclusion. Most patients described as having polymyositis actually have another disease—either inclusion body myositis, necrotizing autoimmune myositis, or antisynthetase syndrome.
May. 03, 2021