A young-onset dementia case associated with PDGFRβ mutation.

We report a case of young-onset dementia (YOD) in a 40-year-old male with a heterozygous missense variant in the PDGFRβ gene. The patient exhibited progressive memory decline and disorientation. Brain MRI and cerebrospinal fluid biomarkers were consistent with Alzheimer's disease. Whole-exome sequencing identified a likely pathogenic PDGFRB c.1316G > A (p.Arg439Gln) variant. This report highlights a novel potential genetic contributor to vascular dysfunction and cognitive decline.