Figure 1.

Plaque phenotypes on gray-scale IVUS. (A) Attenuated plaque: attenuation (asterisk) is observed between 3 to 9 o’clock; (B) echolucent plaque: arrow head indicates echolucent zone in the plaque; (C) calcified nodule: calcified nodule (asterisk) is observed as protrusion of calcified plaque with irregular luminal surface; (D) spotty calcification: arrow indicates small deposit of calcium in the plaque; (E) multiple layer appearance: double arrow heads indicate different layer of the plaque. IVUS, intravascular ultrasound.