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Neurocognitive disorder with Lewy bodies is correct. Per the Dementia with Lewy bodies (DLB) consortium, neurocognitive disorder with Lewy bodies presents with neurocognitive dysfunction but must also have at least 2 of the following symptoms as well: fluctuating cognition, recurrent visual hallucinations (VHS), rapid eye movement (REM) sleep behavior disorder (RBD), and Parkinson symptoms. The fluctuating cognition could be mistaken for delirium, so careful evaluation is needed. Neurocognitive disorder with Lewy bodies is 1 of the 3 α- Synucleinopathies, the other 2 being multiple system atrophy (MSA) and Parkinson’s disease. The pathogenesis is a buildup of α- Synuclein proteins in neurons and glial cells, which leads to cellular death. The location of the cellular damage will dictate which of the 3 α-Synucleinopathies will present. RBD is commonly a precursor to one of the α- Synucleinopathies.
Neurocognitive disorder due to Alzheimer’s disease typically starts with memory impairments and then progresses to include problems with depressive mood, language, mood regulation, and other cognitive processes. Approximately 60-70% of cases of dementia occur due to Alzheimer’s disease.
Neurocognitive disorder due to Huntington’s disease is an autosomal dominantly inherited condition. A key feature of Huntington’s is the chorea movements.
Frontotemporal neurocognitive disorder typically presents earlier than other neurocognitive disorders, usually before the age of 65. Since it affects the frontal and temporal lobes, language and behavior are affected more than with other neurocognitive disorders.
Vascular neurocognitive disorder demonstrates a stepwise progression based on new infarcts. It often occurs with Alzheimer’s disease, and the features can be mixed.