Aqueductal stenosis due to membranous occlusion
Young female with long-standing headaches, vertigo, and blurred vision.
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MR shows marked dilatations of the third and lateral ventricles without periventricular trans-ependymal edema. The fourth ventricle is normal.
Midsagittal T2 DRIVE images show a horizontal membranous / web occlusion at the lower end of the aqueducts.
The tectal plate is unremarkable.
The aqueductal stenosis due to membranous / web occlusion is an uncommon cause of obstructive hydrocephalus.