Positive contrast ventriculography combined with computed tomography: technique and applications.

Injection of contrast material (melgumine iothalamate or metrizamide) into the cerebral ventricles, or into an intracranial cyst directly or through a shunt device, has proven to be of considerable value in the evaluation of hydrocephalus, localized or diffuse, and intracranial cysts. When combined with computed tomography (CT) of the brain (positive contrast CT ventriculography), these procedures become simpler to perform, the incidence of complications is less, and there is a significant increase in their diagnostic yield.