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a, b: Magnetic resonance imaging demonstrates a well-circumscribed posterior epidural mass at the T10-L2 level measuring 110 mm x 18 mm x 12 mm compressing the adjacent segment of the spinal cord. It elicits isointensity to the spinal cord on the T1-weighted image (Fig. 1a) and heterogeneous high intensity on the T2-weighted image, which is consistent with spinal epidural hematoma in the acute phase.
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Preoperative magnetic resonance imaging (MRI) revealed a dorsally placed extradural mass extending from T10 to L1 (Fig. 1), diagnosed as SEH.
a, b: Computed tomography angiography showing venous outflow obstruction of the left renal vein with a narrowed space between the aorta and superior mesencephalic artery (Fig. 2a), resulting in collateralization of venous circulation involving the hemiazygos vein, superior lumbar vein, lumbar veins, radicular veins, and epidural venous plexus (white arrowheads). The left renal vein is cut at the narrowest part of the stenosis (white arrow).
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The narrowed space between the superior mesenteric artery (SMA) and aorta and consequent dilation of the surrounding veins including the spinal epidural venous plexus from T11 to L2 (Fig. 2) was diagnosed as NCS, which was consistent as a cause of SEH.