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Fig. 3B —Digital subtraction angiography (DSA) and CT angiography (CTA) of below-knee arteries of right leg in 54-year-old man with chronic claudication and two proximal high-grade stenoses (not shown). Corresponding CTA image underestimates stenosis of tibiofibular trunk (long arrow) as grade 1 (both observers) but correctly shows grade 3 stenosis (as judged by both observers) of posterior tibial artery (short arrow). Posterior tibial artery (arrowhead) is visualized down to ankle and thus is shown more completely on CTA than on DSA.