1. The ratio between the largest width of the frontal horns and the internal diameter from inner-table to inner-table at this level should be greater than 0.5 in the presence of hydrocephalus.
2. Evan's ratio : Ratio of the largest width of the frontal horns to maximal biparietal diameter is greater than 30% in acute hydrocephalus.
3. Acute frontal angle
4. Temporal horn width >3mm
5. "Mickey mouse" ventricles: Ballooning of frontal horns of lateral ventricles and third ventricle it indicates aqueductal obstruction.
6. Thinned out Corpus Callosum
7. Inferiorly displaced fornix
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