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Although slice differences limit optimal comparability, a subtle high convexity sign was appreciable on her follow-up MRI, as was moderate ventriculomegaly, periventricular white matter changes, and a prominent flow void at the Sylvian aqueduct; however the imaging did not demonstrate disproportionately enlarged subarachnoid spaces or a grossly enlarged Sylvian fissure.
A strong flow void artifact is noted at the Sylvian aqueduct.
Stenosis of Sylvian aqueduct as the cause of hydrocephalus was determined in 8 patients and tectal gliomas in 2 patients.