Low back pain due to spinal chronic subdural hematoma mimicking intradural tumor in the lumbar area: a case report and literature review.

Although magnetic resonance imaging has dramatically enhanced the ability to diagnose spinal mass lesions, some lesions remain difficult to diagnose. We report a spinal chronic subdural hematoma that comprised the cauda equina ventrally in the lumbar area in a 51-year-old man who was under anticoagulant therapy. Low back pain was the only symptom of the patient after sports activity. Surgical treatment was performed 2 months after the onset of symptoms. Intraoperative view showed chronic subdural hematoma with abnormal enlarged dural vascularization. The patient had no preoperative and postoperative neurologic deficit. Low back pain with sudden onset after minor trauma refractory to medical treatment must be investigated with magnetic resonance imaging in patients under anticoagulant therapy for spinal hematoma because of the possibility of spinal chronic subdural hematoma.