[Polymyositis, dematomyositis: overlap syndromes with connective tissue diseases and malignancies].

Polymyositis and Dermatomyositis are often connected with autoimmune diseases and are closely linked with specific autoantibodies. Clinical manifestations are mild in correlation with clinical picture ofmyositis related to malignancy. Pulmonary complications are main cause of mortality in overlap syndromes with autoimmune diseases. Infection, cardiovascular complications and underlying malignancy provide greater mortality risk.