[Psoas tumors]

The authors report a case of benign tumor of the psoas muscle occurring in a 36-year-old man. The diagnosis was based on computed tomography and the patient underwent tumorectomy by an extrapoeritoneal approach. The authors emphasize the ratity f psoas tumors that are usually malignant and the advantage of computed tomography and percutaneous biopsy. Treatment must be incorporated into a multidisciplinary approach in which surgery plays a leading role and must be based on the treatment of soft tissue tumors.