how is it diagonosed?
Diagnosis of the living is referred to as "probable" or "possible" because of the wide range of symptoms with differing levels of severity in each individual
Dementia with Lewy bodies
Dementia with Lewy bodies can only be definitively diagnosed after death with an autopsy of the brain (or in rare familial cases, via a genetic test), so diagnosis of the living is referred to as "probable" or "possible". Diagnosing DLB can be challenging because of the wide range of symptoms with differing levels of severity in each individual. 
how did lewy body dementia get its name Kenji Kosaka what is this dementia? A type of dementia accompanied by changes in sleep, behavior, cognition, movement, and autonomic bodily functions how is it classified? It is one of the two Lewy body dementias, along with Parkinson's disease dementia
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Dementia with Lewy bodies [SEP] Diagnosis
Dementia with Lewy bodies can only be definitively diagnosed after death with an autopsy of the brain (or in rare familial cases, via a genetic test), so diagnosis of the living is referred to as "probable" or "possible". Diagnosing DLB can be challenging because of the wide range of symptoms with differing levels of severity in each individual. DLB is often misdiagnosed or, in its early stages, confused with Alzheimer's disease. As many as one in three diagnoses of DLB may be missed. Another complicating factor is that DLB can occur along with AD; autopsy reveals that most people with DLB have some level of changes attributed to AD in their brains, which contributes to the wide-ranging variety of symptoms and diagnostic difficulty.