Three-layered structure: INTIMA, MEDIA, ADVENTITIA.

Signal-poor muscular MEDIA layer positioned between the thin high backscattering INTIMA layer and a heterogeneous high backscattering ADVENTITIA layer.

The dark band of media is surrounded by the internal elastic membrane and external elastic membrane, two thin layers of elastic fibers at the border between the intima and media, the media and adventitia.

*Guidewire artifact

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