What is small vessel desease brain and what are the odds of getting vascular dementia?

Depends on severity: Small vessel disease is the term used to describe a category of blood vessel damage. Hypertension, cholesterol, and diabetes tend to damage small blood vessels first but the main culprit is systolic hypertension. The risk for vascular dementia is directly related to how bad the extent of damage is in your brain which loosely correlates with white matter damage in MRI