Pulmonary embolus: detection and follow-up using magnetic resonance

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.