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CTA calcification. Left: Positive rim sign (arrow), adventitial calcification measuring <2 mm in thickness with adjacent soft plaque measuring ≥2 mm in thickness. Middle: Adventitial calcification without a rim sign (arrow), adventitial calcification measuring <2 mm in thickness with <2 mm adjacent soft plaque. Right: Bulky calcification (arrow), calcified plaque of ≥2 mm.
