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All patients had cord hyperintensity of T2-weighted images and postgadolinium enhancement on T1-weighted images.Five had vessel-like signal abnormalities in the subarachnoid space on MR.Abnormal intradural vessels were detected in all eight patients with MR angiography.Comparison with digital subtraction angiography revealed these vessels to be primarily enlarged veins of the coronal venous plexus on the cord surface. In six patients,the medullary vein draining the fistula was demonstrated, indicating the level of the fistula,later identified by digital subtraction angiography.After surgical obliteration of the fistula,the draining medullary vein and most or all of the abnormal coronal veins were no longer demonstrated,with decrease or resolution of cord hyperintensity on T2-weighted images.Postgadolinium,spinal MR angiography in cases of suspected dural arteriovenous fistula provides information about intradural veins that supplements the diagnostic value of the MR imaging results,facilitates the subsequent digital subtraction angiography study and,in treated cases,reflects the success of surgery and/or embolization. |
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fistula,arterio-venous,dural
gadolinium
MRI
MRI,abnormal
MRI,angiography
MRI,angiography,contrast enhanced
MRI,contrast enhanced
spinal cord,vascular malformation of
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