FIG 2. Underestimation of stenoses.

A, DSA image of the left common carotid artery depicts a proximal moderate stenosis (straight arrow) and an extremely short distal stenosis (curved arrow) of the internal carotid artery.

B, 3D contrast-enhanced MR angiographic MIP image (magnification factor, 2) depicts the moderate proximal stenosis (straight arrow) and a short band of decreased enhancement (curved arrow) without clear definition of a stenosis.