Distal Superior Cerebellar Artery Aneurysm Presenting with Cerebellar Infarction: Report of Two Cases
Maria Daneta,
Jean Raymonda and
Daniel Roy
,a
a From the Department of Radiology, Centre Hospitalier de l'Université de Montréal, Hôpital Notre-Dame.
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FIG 1. 27-year-old woman with progressive onset of occipital and temporal headache.
A, Contrast-enhanced CT scan shows a well-delineated spontaneously hyperdense lesion with minimal enhancement located above the right cerebellopontine angle.
B, Left vertebral selective angiogram (anteroposterior view) shows slow opacification of the right SCA (arrow).
C, Right SCA supraselective injection shows the fusiform aneurysm of a distal hemispheric branch (arrow).
D, Same injection as in C after embolization shows obliteration of the aneurysm along with its parent artery (arrow points to the coil inside the aneurysm).
E, T2-weighted MR image 2 years after treatment shows the low signal intensity of the coil and almost complete disappearance of the mass.
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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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AJNR - American Journal of Neuroradiology