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. 2022 Apr 28;14:866313. doi: 10.3389/fnagi.2022.866313

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Copyright © 2022 Bonney, Briggs, Wu, Choi, Khahera, Ojogho, Shao, Zhao, Borzage, Wang, Liu and Lee.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Computed tomography (CT) scan from a 70-year-old man with iNPH. (A) Axial image demonstrating Evans Index, which is the ratio of the maximum bifrontal horn width (X) to the maximum biparietal internal diameter of the skull (Y). An Evans Index >0.3 is present in iNPH. (B) Coronal image demonstrating callosal angle, here measured to 68 degrees. Normal callosal angles are greater than 90 degrees, while acute callosal angles occur in iNPH. Disproportionately enlarged subarachnoid space hydrocephalus (DESH) is apparent, as the Sylvian fissures are dilated out of proportion to sulci near the convexity.