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→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'''
*'''Hydrocephalus'''<gallery>File:CT Widening of Evanthe ventricles. In suspected hydrocephalus, see ''s index.jpg|Evan's index is the ratio [[CT of maximum width of the frontal horns to the maximum width of the inner table of the cranium. An Evanhydrocephalus]]''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|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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