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FIG 2. 49-year-old man with 2-day history of dizziness, slurred speech, right-hand incoordination, diplopia, and mild headache.
A, Contrast-enhanced CT scan shows an enhancing well-delineated extraaxial mass in the right ambient cistern. Cystic lesions are also visible within the right midbrain (arrow).
B, Left vertebral selective angiogram (anteroposterior view) shows complete occlusion of the right SCA at its origin (arrow).
C, Unenhanced T1-weighted MR image 1 month after presentation shows high signal intensities consistent with methemoglobin, which was also visible on T2-weighted images (not shown). Cystic lesions of the midbrain are also visible (arrow).
D, T2-weighted MR image 10 months after presentation shows disappearance of the mass. Cystic midbrain lesions are well shown.
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