RecruitingClinical trialCerebral Autosomal Dominant Arteriopathy With Subcortical Infarcts and Leukoencephalopathy (CADASIL) StudyThis is an observational study to better understand the risk factors and progression of CADASIL, a leading cause of vascular cognitive impairment and dementia (VCID). 575 participants will be enrolled and can expect to be on study for up to 5 years.