INPH patients have a heavier burden of hypertension [21–25], diabetes mellitus [22–27], hyperlipidemia , obesity , ischemic heart disease [22–24] and arteriosclerotic cerebrovascular disease  than control groups. Several findings indicate that risk factors for arteriosclerotic cerebrovascular disease are involved in the pathogenesis of iNPH [21, 28], and it has recently been suggested that iNPH may be a subtype of vascular dementia .