Modification of Periventricular Hypodensity in Hydrocephalus with Ventricular Reflux in Metrizamide CT Cisternography

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Abstract
An analysis of metrizamide computed tomography (CT) cisternographic findings in 23 patients with communicating hydrocephalus was carried out. Serial observations of the density in the periventricular area in 19 cases with metrizamide ventricular reflux have revealed the following different pattenrs: precontrast periventricular hypodensity diminishing after CT cisternography and possibly indicating transependymal metrizamide migration (2 cases); periventricular hypodensity unchanged (2 cases); minimal periventricular hypodensity with slight rise in its attenuation values after ventricular metrizamide reflux (4 cases) and no periventricular hypodensity and no change after reflux (6 cases). Preliminary experience indicates that the presence of periventricular hypodensity with an increase in its attenuation values following ventricular reflux of metrizamide is possibly a criterion that may be used in favor of CSF shunting operation.

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