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Subacute clot mimicking flow in a thrombosed arterial bypass graft on two-dimensional time-of-flight and
E K Insko1, E S Siegelman, A H Stolpen
1Department of Radiology, University of Pennsylvania Medical Center, Philadelphia 19104-4283, USA.
Journal of Magnetic Resonance Imaging : JMRI
|March 14, 2000
Abstract:
Subacute intravascular thrombus can contain methemoglobin, which results in very short spin-lattice (T1) relaxation times. We describe a case of a 78-year-old man with increasing right lower extremity claudication. The patient had a thrombosed arterial bypass graft showing high signal intensity that mimicked flow on both two-dimensional time-of-flight and three-dimensional contrast-enhanced MR angiography. Misinterpretation of the high signal thrombus as flowing blood can be avoided by obtaining a precontrast T1-weighted sequence.