Abstract
Neurologists use the eponymous Evans Index to measure cerebral ventricles. It was formulated in 1942 by the Detroit radiologist William A. Evans (1907-1956). The index represents the ratio between the cerebral ventricles' frontal horns' maximal width and the skull's internal diameter. It was developed after studying pneumoencephalography (PEG) in hydrocephalic children. A cut-off value of 0.30 is considered as a pathological sign of ventriculomegaly. This value was found to be valid even nowadays in adults studied by CT or MRI but with less predictive value than in younger adults.
Journal Section:
Historical Note
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S. Karger AG, Basel
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2025
