Figure 4b:

Heavily calcified IPH in left common carotid artery in 85-year-old man. (a–c) Hypointense region (arrow) is seen on TOF (23/3.5, 20° flip angle), fast spin-echo (FSE) (800/11), and magnetization-prepared RAGE (MPRAGE) (13.2/3.2, 15° flip angle) T1-weighted MR images. No high signal intensity is present on any image. (d) On hematoxylin-eosin (H&E)-stained histologic specimen, calcification (arrows) is readily visible and appears to be occupying more than 60% of the area; region outlined by dotted lines is magnified at right. On histologic specimen stained with Mallory trichrome for fibrin and blood (red), a small amount of hemorrhage is visible; region outlined by dotted lines is magnified at right. * = Lumen.