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Umbrella term covering two types of dementia

Lewy body dementia (LBD) is an umbrella term for two similar and common subtypes of dementia:^[1]dementia with Lewy bodies (DLB) and Parkinson's disease dementia (PDD).^[2][3][4][5] Both are characterized by changes in thinking, movement, behavior, and mood.^[1] The two conditions have similar features and may have similar causes, and are believed to belong on a spectrum of Lewy body disease^[2] that includes Parkinson's disease.^[5] As of 2014, they were more often misdiagnosed than any other common dementia.^[6]

The exact cause is unknown, but involves widespread deposits of abnormal clumps of protein that form in neurons of the diseased brain.^[7] Known as Lewy bodies (discovered in 1912 by Frederic Lewy^[8]) and Lewy neurites, these clumps affect both the central nervous system and the autonomic nervous sys