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Magnetic resonance imaging (MRI) of an angiographically confirmed pulmonary embolus was performed. The thrombus appeared as an intense intraluminal signal within the left descending pulmonary artery; this signal was absent on repeat examination after clot lysis. Because MR will not image flowing blood, it provides a potential method of non-invasive identification of stationary emboli within the pulmonary vascular tree.
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Moore et al. (1984) studied this question.