We present two patients who had acute paraplegia with sensory loss due to spontaneous spinal epidural hematoma (SSEH). One had myocardial infraction and the other had deep vein thrombosis, and the former was treated with anticoagulants and the latter was treated with thrombolytic agent. We analyzed the neurological status of our two cases each between its preoperative and postoperative state. Postoperatively both showed no improvement of neurologic symptom, and on follow-up of 12 months, one showed no neurologic improvement and the other showed a insignificant improvement of lower extremity muscle power (trace knee extensor/ankle dorsi-flexor). We thought that this poor outcome was due to delayed operation, which was done more than 24 hr after the symptom onset. The outcome in SSEH is essentially determined by the time taken from symptom onset to operation. Therefore, early and precise diagnosis such as careful history taking and MRI evaluation is necessary.