FIG 2. Images obtained in a 76-year-old man with mild stenosis of the left middle cerebral artery.

A, Anteroposterior angiogram of the left carotid artery shows mild stenoses at the left M1 segment (arrows).

B, Selective MIP image (35/9.6; flip angle, 25°) of MR angiogram in the anteroposterior projection depicts hypointensity that simulates severe stenosis (arrow).

C, Coronal view MPR image (35/9.6; flip angle, 25°) of MR angiogram also shows stenoses of more than 50% at the M1 segment. Two observers overestimated stenosis in this segment.

D, CT angiogram also shows mild stenoses at the M1 segment (arrows). The reviewers correctly interpreted stenosis in this segment.