A venogram is an X-ray of the veins, which is made possible by injecting a radio-opaque dye into the veins. The procedure is called 'venography'.
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Magnetic resonance venography versus contrast venography to diagnose thrombosis after joint surgery. Larcom PG, Lotke PA, Steinberg ME, Holland G and Foster S. Clin Orthop Relat Res. 1996 Oct;(331):209-15.