T2-weighted (A−C) and T1-weighted images following contrast enhancement (D−F) in 3 different patients demonstrate the spectrum of characteristic findings.

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T2-weighted (A−C) and T1-weighted images following contrast enhancement (D−F) in 3 different patients demonstrate the spectrum of characteristic findings of SDAVFs on routine sequences. T2-weighted (A−C) and T1-weighted images following contrast enhancement (D−F) in 3 different patients demonstrate the spectrum of characteristic findings of SDAVFs on routine sequences. A centromedullary edema and perimedullary dilated vessels are the hallmark findings. However, even in the absence of edema (B) or in the absence of pathologic vessels on T2-weighted scans (C), the suspicion of an SDAVF is raised due to the coiled vessels seen on T1-weighted scans after contrast enhancement. While a missing edema might indicate a DAVF picked up early in the course of the disease, the missing flow voids on T2-weighted scans indicate a slow-flowing shunt. T. Krings, and S. Geibprasert AJNR Am J Neuroradiol 2009;30:639-648 ©2009 by American Society of Neuroradiology