Hoffmann U et al published an article in JACC earlier this year on identifying the culprit lesion in patients with infarction.
They found that these plaques had a considerable soft plaque component, with positive remodelling and luminal narrowing. They postulate that it may be possible in the future to characterize possible vulnerable plaques based on morphology, though currently there is overlap between culprit and stable lesions.
This is an example that shows a proximal LAD plaque (Fig. 1), with positive remodelling (red arrowhead - Fig 3) and a small speck of calcium as well (red arrow - Fig. 3). Figs 2 and 4 and proximal and distal to the plaque.