Angiographic features of aqueductal stenosis.

Abstract

1. The diagnosis of simple aqueductal obstruction in adults can usually be suspected from cerebral angiography, provided both supra- and infra-tentorial vessels are well opacified. The morphologic changes seen in aqueductal stenosis are the result of marked pressure hydrocephalus involving the lateral ventricles, the third ventricle and upper portion of the aqueduct above the obstruction with resultant downward axial herniation and compression of the upper brain stem. Narrowing of the anterior basal cisterns and dilatation of the posterior basal cisterns at the tentorial notch are usually marked.2. The angiographic features faithfully reflect the morphologic changes and are described in detail.3. A characteristic deformity of the superior vermis demonstrated by changes in the course of the precentral cerebellar vein and of branches of the superior cerebellar artery is described and illustrated.4. Although the angiographic features of simple aqueductal obstruction in adults are characteristic, contrast stu...