Pulmonary thrombosis. Coloured 3D magnetic resonance imaging (MRI) scan of the heart and lungs of a patient with pulmonary embolisms. This is a frontal view, with the heart (green) seen below the pulmonary blood vessels (blue/white). These take blood between the heart and lungs, and are seen branching out into the lung tissues at left and right. The pulmonary embolisms (blockages of the lung arteriess) have been caused by abnormal blood clots (thrombosis). One blockage is at lower right, seen as an absence of blood flow, and the other is at lower left, seen as a gap in the blood vessel. Such blockages can be swiftly fatal.
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