ST BARTHOLOMEW'S HOSPITAL / SCIENCE PHOTO LIBRARY ST BARTHOLOMEW'S HOSPITAL / SCIENCE PHOTO LIBRARY
Deep vein thrombosis. Coloured angiograms (X-rays) of two views of a leg showing deep vein thrombosis. The thrombus (abnormal clot, white) is blocking the flow of blood (red) in the vein, causing blood to pool beneath it (lower left & right). Bone is grey. Deep vein thrombosis is most common in the legs, occurring when a thrombus forms in undamaged deep-lying veins. The restricted blood may cause pain, swelling and tissue death. The angiograms were produced by injecting a radio-opaque dye into the blood system.
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