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Figure 1 Diagnosis of in-stent restenosis. A curved multiplanar reformatted (MPR) two-dimensional image of the long axis of the stent is shown (center). The proximal portion (upper) of the stent (A) shows lack of contrast enhancement in relation to the distal portion of the stent (B), demonstrating restenosis in the proximal portion of the stent (quantitative coronary angiography 78%, multidetector computed tomography grade 4). The center line is drawn along the long axis of the stent, and cross-sections taken perpendicular to the center line show lack of contrast in the proximal portion of the stent (A, right) and contrast enhancement in the distal portion of the stent (B, left).