Figure 4b. Right-sided amaurosis fugax. (a) Right anterior oblique digital subtraction arteriogram of the right carotid artery bifurcation before intervention. Misregistered washer on the image at the angle of the mandible is an external calibration marker used in the measurement of the diameter and length of the diseased segment. Just anterior and superior to the washer is a severe right internal carotid artery stenosis (arrow) involving the bulb and proximal internal carotid artery. (b) Lateral digital subtraction arteriogram obtained after placement of a nitinol self-expanding stent (arrows).