Imaging Collateral Circulation
Magnetic Resonance Angiography and Perfusion Magnetic Resonance Imaging at 3 T
Arch Neurol. 2005;62:492-493.
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A 29-year-old woman presented with involuntary left limb twitching and jaw grinding. Magnetic resonance angiography at 3 T showed loss of the right middle cerebral artery flow signal and collateral vascular supply from the vertebrobasilar circulation (Figure 1). Dynamic contrast-enhanced perfusion magnetic resonance imaging revealed normal perfusion in the areas of the brain supplied by these collateral vessels but increased transit time in the right frontal lobe due to delayed perfusion by the leptomeningeal collateral circulation (Figure 2). Internal carotid artery dissection was subsequently confirmed by catheter angiography.
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Figure 1. Magnetic resonance angiogram shows absence of flow signal in the right middle cerebral artery with multiple collateral vessels from the posterior cerebral artery (arrowheads).
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Figure 2. Perfusion magnetic resonance imaging reveals delayed contrast arrival (red curve in the right image) and increased transit time in the right frontal lobe (red and yellow areas in the left . . . [Full Text of this Article]
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AUTHOR INFORMATION
Christabel E. C. Lee, MBBS, FRCR;
H. B. Ivan Ng, MBBS (Singapore), FRCS (Neurosurgery) (UK);
Chun Wai Yip, MBBS, MRCP (Int Med) (UK);
C. C. Tchoyoson Lim, MBBS, FRCR
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ABSTRACT
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