DEEP VEIN THROMBOSIS. Deep vein thrombophlebitis _Phlebography of the left calf in front view. Thrombophlebitis is an inflammation of the veins associated to a thrombosis that is generally the cause. Deep vein thrombosis is the formation of thrombus at the level of the leg deep veins here, tibial veins.It is more frequent among persons who remain sitted long hours at work. It is also the pathology of the economy class syndrome or jet leg, occuring to persons taking frequent long_haul flights. Th