fig4

Figure 4. Hallmark features of CCNs on IVUS. (A) IVUS shows an eccentric, hyperechoic lesion with acoustic shadowing irregularly protruding into the vessel lumen, characteristic of an eruptive CCN; (B) IVUS shows a severe nodule, indicated by the yellow arrow, with an irregular leading edge of calcium. CCNs: Calcified coronary nodules; IVUS: intravascular ultrasound.