Classical normal pressure hydrocephalus
65 years old male was referred for evaluation of the classical triad of gait disturbance,urinary incontinence,and dementia.
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MR images show grossly dilated ventricles without evidence of obstruction or brain atrophy.There was C.S.F. flow void in the aqueduct of Sylvius ( seen as black area in transverse section at midbrain level )
The corpus callosum was thinned out and bowed.