FIG 1. CT and MR images obtained in a 47-year-old woman with unilateral thrombosis of the left ICV.

A, Nonenhanced cerebral CT scan shows a circumscribed hypoattenuation in the left thalamus and adjacent internal capsule (white arrowheads).

B, Hyperintense area of edema on T2-weighted MR image corresponds to hypoattenuation in A.

C, T1-weighted MR image shows high signal intensity in the left ICV (small white arrowheads) that is strongly indicative of an intraluminal clot.

D, After contrast material administration, the left ICV is unidentifiable in its entire length (large white arrowhead).

E, Intraluminal irregularities and filling defects in the dorsal portion of the ICV (large white arrowhead), together with findings in D, confirm the diagnosis of unilateral ICV thrombosis.

F and G, MR images obtained 2 years after unilateral ICV thrombosis show complete recanalization of the left ICV and no residual parenchymal defects (T2-weighted and T1-weighted).