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Fig. 6C —Schema for measuring renal artery affected by stenosis due to
ostial atherosclerosis. Drawing shows area and diameter measurements. A1 =
luminal cross-sectional area at point of maximum stenosis, A2 = luminal
cross-sectional area at maximum dilatation distal to point of stenosis, A3 =
luminal cross-sectional area immediately proximal to bifurcation, D2 = maximum
diameter at point corresponding to A2, D3 = maximum diameter at point
corresponding to A3.
