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OtherBRAIN

The Hypodense Artery Sign

Thomas C. Lee, Eric S. Bartlett, Allan J. Fox and Sean P. Symons
American Journal of Neuroradiology September 2005, 26 (8) 2027-2029;
Thomas C. Lee
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Eric S. Bartlett
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Allan J. Fox
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Sean P. Symons
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    Fig 1.

    A 78-year-old woman who had undergone a mitral valve replacement.

    A–C, Axial images from the initial CT head scan obtained on the first postoperative day demonstrate an early left middle cerebral artery territory infarct. There is a fat attenuation filling defect (arrow, B) in the region of the proximal left middle cerebral artery trunk.

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    Fig 2.

    CT angiography axial image obtained 13 days postoperatively confirms that the fat attenuation lesion (arrow) is within the proximal left middle cerebral artery trunk.

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    Fig 3.

    Axial and coronal T1-weighted MR images obtained 49 days postoperatively without fat saturation (A,B) and with fat saturation (C,D). The images without fat saturation demonstrate the T1-hyperintense embolus (arrow) in the proximal left M1 trunk. After fat saturation, the T1 hyperintensity of the embolus is saturated (arrow), confirming its fatty composition. High-signal-intensity methemoglobin in the adjacent infarct is unchanged before and after fat saturation.

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American Journal of Neuroradiology: 26 (8)
American Journal of Neuroradiology
Vol. 26, Issue 8
1 Sep 2005
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Thomas C. Lee, Eric S. Bartlett, Allan J. Fox, Sean P. Symons
The Hypodense Artery Sign
American Journal of Neuroradiology Sep 2005, 26 (8) 2027-2029;

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The Hypodense Artery Sign
Thomas C. Lee, Eric S. Bartlett, Allan J. Fox, Sean P. Symons
American Journal of Neuroradiology Sep 2005, 26 (8) 2027-2029;
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