332 T9 K.-J. Song, K.-B. Lee T11 Fig. 1. Saggital T2 weighted MR Image sh- ows the heterogenous hyperintense lesion with focal areas of hypointensity posterior to the compressed spinal cord in T8-L2 level. Fig. 3. Operative finding: Spinal cord is com- pressed by extensive blood clot and old he- matoma. No other vascular abnormality. Fig. 4. Saggital T2 weighted MR Image sh- ows the heterogenous hyperintense lesion with focal areas of hypointensity posterior to the compressed spinal cord in T12-L2 level. T10 T12 Fig. 2. Axial T2 weighted MR image shows the spinal cord com- pressed by the hyperintense lesion posterior to it in T10 level. Fig. 5. Axial T2 weighted MR image shows the spinal cord com- pressed by the hyperintense lesion posterior to it in T12 level. Case 2 A 39-yr-old man was diagnosed with deep vein thrombo- sis (left common iliac, external iliac, superficial femoral, com- mon femoral vein) at department of general surgery, and he was treated with the infusion catheter urokinase (1,100,000 unit/14 hr). The following day, he was performed with aspi- ration thrombectomy and stent at the department of diag- nostic radiology, followed by the infusion catheter urokinase (1,000,000 unit/6 hr) treatment. During that evening, at 6:00 p.m., he felt the lower back discomfort and mild pain. And the physician ordered a pain killer. Because this pain disap- peared soon, the physician was not in an account. The morn- ing after onset of symptom, he felt decreased motor and sen-