ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Blood clot in the heart. Sequence of coloured magnetic resonance imaging (MRI) scans showing thrombosis or embolism (pink) in the left ventricle of the heart. A thrombus or embolus is caused by a clot of blood factors, such as platelets. A thrombus forms at the site it is blocking, while a embolus forms elsewhere and is carried to the blockage site by the blood flow. The blockage can be fatal if left untreated. Treatment is with thrombolytic drugs to breakdown the clot and anticoagulants to prevent further clotting. In some cases surgery is necessary to remove the clot.
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