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[[File:CT of Evan's index.jpg|thumb|180px|Evan's index]]*'''Hydrocephalus''': Evan's index is the ratio of maximum width of the frontal horns to the maximum width of the inner table Widening of the craniumventricles. An EvanIn suspected hydrocephalus, see 's index more than 0.31 indicates ''[[CT of hydrocephalus.<ref name="IshiiKawamata2010">{{cite journal|last1=Ishii|first1=Mitsuaki|last2=Kawamata|first2=Toshio|last3=Akiguchi|first3=Ichiro|last4=Yagi|first4=Hideo|last5=Watanabe|first5=Yuko|last6=Watanabe|first6=Toshiyuki|last7=Mashimo|first7=Hideaki|title=Parkinsonian Symptomatology May Correlate with CT Findings before and after Shunting in Idiopathic Normal Pressure Hydrocephalus|journal=Parkinson]]'''s Disease|volume=2010|year=2010|pages=1–7|issn=2042-0080|doi=10.4061/2010/201089}}</ref>
→Evaluation: Linked
Evaluation encompasses the absence of presence of the following:<ref name=GraingerAllison>Unless else noted in the list, reference is: {{cite book|title=Grainger & Allison's Diagnostic Radiology|author=Andy Adam, Adrian K. Dixon, Jonathan H Gillard, Cornelia Schaefer-Prokop, Ronald G. Grainger, David J. Allison|edition=6, revised|publisher=Elsevier Health Sciences|year=2014|isbn=9780702061288}}</ref>
*'''Masses'''
*'''Vascular disease''': Territorial infarcts, lacunar strokes, as well as lesions in thalamus or white matter
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