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Figure 1 Example of ruptured and nonruptured plaques in right coronary artery. Intravascular ultrasound (IVUS) images of proximal reference, target site and distal reference of ruptured plaque (A–C) and nonruptured plaque (D–E) are shown on side panels. Sites of IVUS image acquisition are indicated on angiogram (center). Schemes next to IVUS images indicate boundaries of lumen, external elastic membrane and cavity inside ruptured plaque (*). Note eccentric plaque distribution and lumen position at site of plaque rupture (B).