Is there a relation between later life dementia and multiple sclerosis?

Perspective: Multiple sclerosis does not cause alzheimer's but can cause significant cognitive problems if not controlled. About 60% of pts with ms will have problems, and at least 30% of pts with initial ms have issues on neuropsych testing. About 10-12% in the end will seem severely demented. With modern, more potent meds, far fewer are likely to get severely disabled in this fashion.

Dementia and MS: Sometimes a long history of aggressive or poorly-managed MS can result in symptoms like dementia. Perhaps this could be called "MS dementia". There is no association of MS and Alzheimers disease or other illnesses that are considered causes of dementia. These are distinct illnesses.