What is the difference between DVT and a superficial venous thrombosis?

Both deep vein thrombosis (DVT) and thrombophlebitis are vascular conditions in which the veins become inflamed and blood clots form inside. These conditions almost always develop in the veins in the legs, but occasionally occur in the arms or, more rarely, other parts of the body. Thrombophlebitis occurs in the veins close to the skin, the superficial veins, while DVT occurs in the deep veins, those farther below the skin surface.

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