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Figure 2 Serial intravascular ultrasound images of the same segment of the proximal left anterior descending artery immediately distal to the bifurcation of the left main coronary artery in a heart transplanted from a female donor to a male recipient. In the first month after heart transplantation (A), the cross-sectional area of the left anterior descending artery measured 19.60 mm2, whereas at the first annual transplant evaluation it measured 22.64 mm2, an increase of 15.5% over one year.