## Behavioral Variant Frontotemporal Dementia (bvFTD) **Key Point:** bvFTD is characterized by early behavioral and personality changes with relative preservation of memory in the initial stages, distinguishing it from Alzheimer's disease. ### Clinical Presentation of bvFTD **Early Features (Diagnostic Hallmark):** 1. Behavioral disinhibition - Socially inappropriate behavior - Impulsivity - Lack of social awareness 2. Apathy and loss of motivation 3. Personality change (often dramatic) 4. Emotional blunting or inappropriate affect **Memory Profile:** - Memory relatively preserved early (unlike Alzheimer's) - Executive dysfunction prominent - Impaired decision-making and judgment ### Frontotemporal Dementia Variants Comparison | Variant | Primary Feature | Pathology | Presentation | |---|---|---|---| | **bvFTD** | Behavioral/personality change | Tau or TDP-43 | Disinhibition, apathy, personality change | | **Semantic Dementia** | Language/naming | TDP-43 | Progressive anomia, word-finding difficulty | | **nfvPPA** | Non-fluent/agrammatic speech | Tau or TDP-43 | Effortful speech, agrammatism | | **Lewy Body Dementia** | Visual hallucinations, parkinsonism | Alpha-synuclein | Fluctuation, hallucinations, extrapyramidal signs | **High-Yield:** The **Lund and Manchester criteria** define bvFTD by early behavioral change with preserved memory — this is the diagnostic anchor. **Mnemonic: BVFTD = Behavioral Variant FTD** - **B**ehavioral disinhibition - **V**alue change (personality) - **F**rontotemporal atrophy - **T**au/TDP-43 pathology - **D**ecision-making impaired ### Neuroimaging Findings Frontal and anterior temporal lobe atrophy on MRI, with relative sparing of the medial temporal lobe (unlike Alzheimer's). **Clinical Pearl:** Patients with bvFTD often present to psychiatry first because behavioral symptoms dominate; cognitive testing may initially appear relatively normal, leading to diagnostic delay.
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