FIG 2. Left ICA angiograms.

A, Anteroposterior projection reveals severe stenosis of the proximal cavernous segment of the left ICA and prethrombotic stenosis (arrow) in the M1 segment of the left MCA. Note the moyamoya-like collateral vascular structure around the proximal portion of the left MCA.

B, Right anteroposterior arteriogram also shows severe stenosis (arrow) of the proximal cavernous segment of the right ICA.