Callosal Angle Research Articles

Radiological diagnosis of occult normal-pressure hydrocephalus.

Abstract Radiological findings were reviewed in 41 patients with ventricular shunts because of a diagnosis of occult normal cerebrospinal fluid (CSF) pressure hydrocephalus (NPH). Findings included (a) enlargement of the anterior portion of the lateral ventricle, (b) corpus callosal angle of 120° or less on the anteroposterior film with the patient supine, and (c) wide basilar cisterns with abrupt obstruction of upward gas flow. On cisternography, early and persistent radioactivity in the ventricles and failure of isotope concentration in parasagittal areas was seen. Delay in the rise of the isotope to the parasagittal regions may suggest atrophy. Cerebral angiography in patients with NPH shows findings characteristic of obstructive hydrocephalus.