MSH: An imprecise term referring to dementia associated with CEREBROVASCULAR DISORDERS, including CEREBRAL INFARCTION (single or multiple), and conditions associated with chronic BRAIN ISCHEMIA. Diffuse, cortical, and subcortical subtypes have been described. (From Gerontol Geriatr 1998 Feb;31(1):36-44),NCI: A degenerative vascular disorder affecting the brain. It is caused by the blockage of the blood supply to the brain. It is manifested with decline of memory and cognitive functions.