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Ulcer entry and exit flow analysis. A) There is slipstream entry into the distal neck of the ulceration (arrow). B) Sluggish swirling slipstreams in a reverse vortex pattern are seen within the ulceration. C) Injections into different slipstreams show an opacified slipstream exiting the proximal neck of the ulcer (arrow) and being sucked into the central jet of the stenosis.
