[Muscular metastasis in a patient with adenocarcinoma of the colon. An infrequent complication].

Muscular metastases are unusual. Primary neoplasm use to be breast or lung, although any neoplastic process can have muscular metastatic potential. The usual location in psoas and paravertebral muscles. For its diagnosis we need a high index of suspicion, and can be helpful, electromyography and magnetic nuclear resonance. The follow up of a patient with colon adenocarcinoma and muscular metastases and a review of the subject is presented.