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Fig. 4B —Digital subtraction angiography (DSA) and CT angiography
(CTA) of right leg in 51-year-old woman with critical lower leg ischemia.
Corresponding CTA maximum-intensity-projection (MIP) reconstruction image
shows extensive calcification of common femoral artery (short arrows)
and area of calcification of popliteal artery (long arrow). Based on
MIP reconstruction, it is unclear whether these calcifications cause stenoses.
Grade 1 collaterals (arrowheads) are shown, but they are less
extensive on CTA than on DSA. CTA depicts all three arteries of proximal lower
leg that cannot be seen on DSA and shows them to be patent.
