| A rare form of idiopathic inflammatory myopathy with clinical manifestation of acute or subacute proximal muscle weakness and histopathological features of myocyte necrosis and regeneration without significant inflammation. The main presenting feature is subacute severe symmetrical proximal myopathy with a markedly elevated creatine kinase level. The course is often severe but may be self-limiting and recovery may occur within weeks to months of discontinuing the causative agent, if identified. The disease is thought to be related to an immune response possibly triggered by drug therapy, connective tissue diseases, or cancer. The exact mechanism underling the disorder is not known but some autoantibodies appear to be a likely cause. Malignancy may be involved. |
