DVT is the formation of a clot ("thrombus") in a vein. It is a form of thrombophlebitis (inflammation of a vein with clot formation). Deep vein thrombosis commonly affects the leg veins (such as the femoral vein or the popliteal vein) or the deep veins of the pelvis. Occasionally the veins of the arm are affected. A DVT can occur without symptoms, but in many cases the affected extremity will be painful, swollen, red, warm and the superficial veins may be engorged....
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