[Polymyositis and cerebral metastasis as the initial manifestation of a carcinoma of unknown origin. Apropos of a case].

Polymyositis is an acute or chronic inflammatory myopathy, being its association with malignancy object of controversy. We report a case of a young male patient, in whom the presence of brain metastases and polymyositis were the initial manifestation of a neoplasm of unknown origin, fact rarely described in literature.