Clinical considerations regarding suspected "BvFTD-by-proxy": a case series.

A diagnosis of behavioral variant frontotemporal dementia (bvFTD) often relies on informant reports of significant behavioral changes. "BvFTD-by-proxy" describes situations of neuropsychiatric changes reported solely by an informant under circumstances that may raise questions regarding their objectivity. We present three cases of bvFTD-like symptoms reported by spouses, where progression was unclear, testing showed mild but stable executive dysfunction, and neuroimaging was unremarkable. The subjective nature of bvFTD criteria leaves patients vulnerable to misleading informant reports, especially amid relational discord, and may threaten patient autonomy. Recognizing and managing this situation is critical but time-consuming, often requiring coordinated care across multiple providers.