Subacute clot mimicking flow in a thrombosed arterial bypass graft on two-dimensional time-of-flight and three-dimensional contrast-enhanced MRA

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...

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Bibliographic Details
Published in:Journal of magnetic resonance imaging 2000-02, Vol.11 (2), p.192-194
Main Authors: Insko, Erik K., Siegelman, Evan S., Stolpen, Alan H.
Format: Article
Language:English
Subjects:
Aged
bypass graft
Graft Occlusion, Vascular - diagnosis
Humans
Image Processing, Computer-Assisted
Leg - blood supply
Magnetic Resonance Angiography - methods
Magnetic Resonance Imaging - methods
Male
methemoglobin
MRA
Regional Blood Flow
Thrombosis - diagnosis
thrombus
time-of-flight
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Summary: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. J. Magn. Reson. Imaging 2000;11:192–194. © 2000 Wiley‐Liss, Inc.
ISSN:1053-1807
1522-2586
DOI:10.1002/(SICI)1522-2586(200002)11:2<192::AID-JMRI17>3.0.CO;2-1