Fig. 1.

CTA of the carotid arteries. On the upper left panel, maximum intensity projection (MIP) of the left carotid bifurcation is shown, on the upper right panel a MIP of the right carotid bifurcation. White arrows indicate decreased contrast opacification in the internal carotid arteries, the actual thrombus could not be visualized.

In the lower panel an axial MIP of the circle of Willis. The arrows indicate near complete absence of vascular enhancement in the vascular territories of the anterior and part of the medial cerebral arteries due to diffuse arterial thrombosis.