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In case of a high-grade stenosis at the internal carotid artery (ICA) origin with a normal poststenotic vessel ( a ), a diagnostic wire (black) is navigated through the stenosis ( b ). A diagnostic catheter (purple) is then advanced past the stenosis ( c ). Once this is done, a balloon-guide catheter (gray) can be placed in the proximal ICA ( d ) and the procedure is continued as usual.
