According to an observational analysis, the location and amount of brain microbleeds may indicate the risk of dementia. In subjects with cerebral microbleeds detected on MRI, this risk is higher compared with controls without them. Microbleeds are tiny drops of blood in the brain. Small bleeds in the brain can occur without immediate serious symptoms, but over time lead to neurological problems, including dementia. They occur when small vessels and penetrating arteries are affected, which supply the deep structures of the white matter of the brain. They are related to vascular pathology in Alzheimer's disease and mixed dementia. Intracerebral hemorrhage occurs in 20–40% of patients with subarachnoid hemorrhage complications.[2]