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Aortic Dissection

CT Features that Distinguish True Lumen from False Lumen

¹ Department of Radiology, University of Michigan Health Center, Box 0030, 1500 E. Medical Center Dr., Ann Arbor, MI 48109-0030.
² Zuedema Program for Surgical Core Outcomes Research and Evaluation, University of Michigan Health Center, Ann Arbor, MI 48109.
³ Department of Surgery, Section of Cardiothoracic Surgery, University of Michigan Health Center, Ann Arbor, MI 48109.

OBJECTIVE. The purpose of this study was to determine which CT findings are reliable indicators of the true or false lumen in an aortic dissection.

CONCLUSION. The beak sign and a larger cross-sectional area were the most useful indicators of the false lumen for both acute and chronic dissections. Features generally indicative of the true lumen included outer wall calcification and eccentric flap calcification. In cases showing one lumen wrapping around the other lumen in the aortic arch, the inner lumen was invariably the true lumen.

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