[Dermatomyositis: a paraneoplastic symptom].

Paraneoplastic syndromes are a group of signs and symptoms caused by a malignancy, which are not due to direct invasion or metastasis of this malignancy. Dermatomyositis is an idiopathic myopathy mainly consisting of proximal muscle weakness, associated with skin lesions. There is a well known association between dermatomyositis and malignancy.