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Figure 1: Vascular parkinsonism and idiopathic normal pressure hydrocephalus: (a) Vascular parkinsonism: Axial brain MRI T2W sequence shows extensive subcortical and periventricular white matter hyperintensities (The Fazekas scale = 3). (b) Idiopathic normal pressure hydrocephalus (iNPH): Axial brain CT shows dilatation of lateral and third ventricle with Evan's ratio of 0.34. (c) Coronal brain CT shows pattern of “disproportionately enlarged subarachnoid space hydrocephalus (DESH)” in iNPH; the widening of Sylvian fissures (white arrow head) out of proportion to the cortical sulci at the vertex (white arrow)

Figure 1: Vascular parkinsonism and idiopathic normal pressure hydrocephalus: (a) <i>Vascular parkinsonism:</i> Axial brain MRI T2W sequence shows extensive subcortical and periventricular white matter hyperintensities (The Fazekas scale = 3). (b) <i>Idiopathic normal pressure hydrocephalus (iNPH)</i>: Axial brain CT shows dilatation of lateral and third ventricle with Evan's ratio of 0.34. (c) Coronal brain CT shows pattern of “disproportionately enlarged subarachnoid space hydrocephalus (DESH)” in iNPH; the widening of Sylvian fissures (white arrow head) out of proportion to the cortical sulci at the vertex (white arrow)