Other Lewy Body Disorders
Lewy bodies, abnormal clumps of protein found in the brains of people with PD, are also found in other dementing illnesses that go by the names Dementia with Lewy Bodies (DLB), and the Lewy body variant of AD (LBVAD). In fact, Lewy Body disorders are the second most common form of dementia, after AD.
DLB can be difficult to distinguish from AD or PD with dementia (PDD). One difference is that people with DLB often have hallucinations. In addition, people with DLB react very poorly to anti-psychotic medications such as Haldol and Thorazine. Also, while people with DLB may have Parkinsonian symptoms, the dementia usually appears first, while most people with PDD develop dementia later in the disease course.