ct findings included : ( 1 ) iliac artery aneurysm , ( 2 ) vena caval dilatation , ( 3 ) rapid flow of contrast medium from the arterial side into the dilated inferior vena cava on dynamic scanning , ( 4 ) increased density of the inferior vena cava similar to that of the aorta caused by entry through the fistula of blood with a high concentration of iodinated contrast medium , and ( 5 ) the actual fistula connecting the two vessels .
C0080304
fistula
C0016169
fistula