JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Deep vein thrombosis. Artwork of the major blood vessels and bones of the male lower torso and thigh showing femoral vein thrombosis. Thrombosis is the formation of a thrombus (blood clot) within an intact blood vessel. The vena cava (main vein, blue) and the aorta (main artery, red) branch to the kidneys (top) and down into the legs. The bones shown are the spine (upper right, behind blood vessels), the pelvis (butterfly-shaped) and the femur (thigh bone, lower frame). Thrombi are shown as the clots (red) in the cut away deep femoral vein (blue) in lower frame. Deep vein thrombosis is caused by slow blood flow or an increase in natural blood clotting factors.
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