Response to Letter by Sohn et al
2007
Response: We appreciate the comments by Sohn et al concerning our study comparing preperfusion and postperfusion
magnetic resonance angiography(
MRA) in acute stroke.1 After studying 10 patients with postperfusion
MRAand
digital subtraction angiography, Sohn et al suggested that most cases of better
middle cerebral arteryflow after contrast are attributable to collateral flow. We would like to make some observations regarding their findings. The results we reported suggest a rather more complex scenario. All the …
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