Metrizamide and radionuclide cisternography in communicating hydrocephalus.

Simultaneous 111In-DPTA and metrizamide CT cisternography correlated closely in the qualitative imaging of cerebrospinal fluid (CSF) dynamics in 9 normal patients and in 11 patients thought to have communicating hydrocephalus. CSF clearance of both tracers was similar; significant absorption occurred in the spinal dural sac. Although delayed elevated serum iodine levels correlated highly with abnormal persistent ventricular penetration (detection at 48 hours), these levels cannot be used to predict abnormal ventricular stasis. The pattern of ventricular and cortical sulcus enlargement on the plain CT scan did not indicate whether the dynamic metrizamide cisternogram would be normal or abnormal.

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