<prompt> Most common CNS manifestation of HIV Infection is:Acute MeningitisEncephalopathyVacuolar myelopathyDementia  <response>: HIV Encephalopathy also called HIV - Associated dementia or AIDS dementia. This is generally a late complication of HIV infection, it can be seen patients with CD4 count 350 cells. HIV encephalopathy is a sub-cortical dementia while . Alzheimers is a cortical dementia Alzheimers disease is the most common cause of dementia in elderly. Most important risk factor for Alzheimer disease is age 