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Figure 4 Example of a Patient Without Coronary Artery Calcium but With Obstructive CAD

This patient presented with suspected acute coronary syndrome. Multislice computed tomography showed no coronary artery calcium (A). However, obstructive noncalcified plaque and superimposed thrombus was observed in the distal segment of the right coronary artery on multislice computed tomography. (B) Volume-rendered reconstruction. (C) Multiplanar reconstruction, arrow indicating obstructive coronary artery disease (CAD) in right coronary artery (RCA). This finding was confirmed by conventional coronary angiography. (D) Conventional coronary angiography showing obstructive CAD in RCA (arrow). Ao = aorta; LAD = left anterior descending coronary artery; LCx = left circumflex coronary artery.