Introduction:

Dermatomyositis is an autoimmune muscle inflammation exhibited rash, and proximal muscle weakness, associated with cardiac complications such as myocarditis and / or conduction disorders. In some cases, it can be the only clinical manifestation of hidden malignancy, so its early detection can have great repercussions on the prognosis of the hidden tumor.

Objective:

To describe the case of a patient with a paraneoplastic syndrome caused by dermatopolymyositis as an unusual presentation of breast cancer.

Clinical case report:

This is a patient in her fifties with no significant clinical personal history, who had disabling proximal weakness, predominantly in her upper limbs, fever and significant elevation of creatine kinase (CPK), under a diagnosis of dermatopolymyositis as the main manifestation of an infiltrating breast cancer.

Conclusions:

Dermatomyositis in middle-aged women should make us suspect an occult neoplastic pathology. The most important is to rule out breast cancer.

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