Most of us are familiar with Alzheimer's and that may be all we know about dementia. But almost half of all people with progressive dementia have something other than Alzheimer's. Among the most common of the other forms is Lewy Body Dementias.
The Lewy Body Dementia Association has a very helpful short summary of ten things worth knowing if someone you know has either Parkinson's Disease with Dementia or Dementia with Lewy Bodies.
You can find in on their excellent website: http://www.lbda.org/content/10-things-you-should-know-about-lbd