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

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

A superficial venous thrombosis (also called phlebitis or superficial thrombophlebitis) is when blood clots develop in a vein close to the surface of your skin. These types of blood clots rarely travel to your lungs unless they move from the superficial system into the deep venous system first. While a physician can diagnose superficial vein clots with a physical exam, they can only diagnose DVT with an ultrasound.