fig1

Figure 1. Key morphological differences between eruptive and non-eruptive CCNs. (A) Non-eruptive nodules typically have smooth surfaces without overlying thrombus; (B) Eruptive nodules demonstrate irregular surfaces protruding into the vessel lumen, often with superficial thrombus; (C) OCT image of a non-eruptive CCN with a smooth fibrous cap; (D) OCT image of an eruptive CCN with fragmented, protruding calcium extending into the lumen. CCNs: Calcified coronary nodules; OCT: optical coherence tomography.