Coronary CT angiography: Diagnostic value and clinical challenges

Figure 6 A severely calcified plaque is present in the left coronary artery (ramus intermedius) (A, arrow), with impression of more than 90% lumen stenosis on a 2D axial image. Corresponding 3D virtual endoscopy views shows the intraluminal protrusion sign due to presence of plaque (B, arrows), but with less than 60% lumen stenosis.