Fig. 5.

Ultra-high-resolution photon-counting detector CT angiography in a 72-year-old female with severe aortic valve stenosis and a history of coronary stenting. A Three-dimensional cinematic reformation illustrating the stent in the left circumflex coronary artery (arrowheads). B Curved multiplanar reformation of the proximal left circumflex coronary artery reveals an intraluminal hypoattenuation (arrowhead), suggesting severe stenosis or complete obstruction of the in-stent lumen. C Invasive angiography (RAO 20°, CAU 10°) corroborates the obstruction of the in-stent lumen (arrowheads). Notably, the vessel’s distal part is perfused retrogradely through collateral channels (star)