Femoral vein, recent thrombus, gross
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Thrombi on the venous side of the circulation are often called red thrombi, because the low velocity flow of blood enables them to trap many RBCs within the developing fibrin network of the thrombus. This is well-shown in this photograph of a thrombus within the femoral vein. The deep veins of the leg are the most likely site for the formation of venous thrombi.