"type 1: partial ("
"type 2: near-complete (90-100%) SVC obstruction, with antegrade flow in the azygos vein"
"type 3: near-complete (90-100%) SVC obstruction, with retrograde flow in the azygos vein"
"type 4: complete SVC obstruction with azygos vein obstruction"
"type 1: bilateral brachiocephalic vein occlusion +/- supra-azygos SVC"
"type 2: supra-azygos SVC obstruction without brachiocephalic vein involvement"
"type 3: SVC obstruction at the level of the azygos terminus"
"type 4: SVC obstruction inferior to the azygos terminus"
"grade A: moderate to severe (50-90%)"
"grade B: pre-occlusive (90-100%)"
"grade C: complete occlusion (100%)"
"grade B: pre-occlusive (90-100%)"
Expected headings
"Stanford classification"
"Azizi classification"