Muscular metastases are rarely found in medical practice, and the reported cases in literature are not numerous. The diagnosis of these lesions involves an interdisciplinary collaboration. We present a case of secondary determination in the psoas muscle, with a starting point of cervical squamous carcinoma. In establishing the diagnosis, there contributed the clinical, imagistic and magnetic resonance evaluation and computed tomography (CT), the histopathological diagnosis being determined after the CT-guided biopsy puncture.