Their study suggests that changes in a structure called the choroid plexus may predict who is more likely to develop dementia later in life. The choroid plexus is a network of specialised cells found inside the brain’s fluid-filled spaces. They measured both the size of the choroid plexus and the strength of MRI signals that reflect tissue health. This study provides important evidence that the choroid plexus may become an important biomarker for dementia risk. If you care about dementia, please read studies about Vitamin B9 deficiency linked to higher dementia risk, and flavonoid-rich foods could help prevent dementia.