RESUMEN
Objetive: to describe a patient with radicular pain secondary to a psoas muscle hematoma. Description: a 76 years old female, suffering from hypertension and medicated with anticoagulants after a triple coronary stent, complained of lumbar pain treated with analgesics and physiotherapy. The pain persisted and the condition worsened with the appearance of proximal crural paresia. An MRI showed an increased volume of the right psoas iliac muscle due to a hematoma. Intervention: anticoagulants were suspended and a neurological evaluation was done. The pain, paresia and hematoma receded. Conclusion: spontaneous hematoma of the psoas muscle is an infrequent cause of radicular syndrome although it should be taken into consideration in patients medicated with anticoagulants.