FIG 3. Progression of near occlusion to occlusion.

A, Lateral carotid angiogram shows ulcerated stenosis causing near occlusion with ICA diameter beyond the stenosis (larger arrow), reduced in diameter to be smaller than the distal ECA diameter (smaller arrow). It should be about twice that diameter.

B, Lateral carotid angiogram of the same carotid as A about 8 months later shows that the near occlusion has progressed to occlusion.