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→Evaluation: +Evan's index
*'''Masses'''
*'''Hydrocephalus'''
<gallery>File:CT of Evan's index.jpg|Evan's index is the ratio of maximum width of the frontal horns to the maximum width of the inner table of the cranium. An Evan's index more than 0.31 indicates 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 gallery|journal=Parkinson's Disease|volume=2010|year=2010|pages=1–7|issn=2042-0080|doi=10.4061/2010/201089}}</ref></gallery>
*'''Vascular disease''': Territorial infarcts, lacunar strokes, as well as lesions in thalamus or white matter
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