Vascular cognitive impairment is closely related to stroke. Each condition is a risk factor for the other. Cognitive impairment is a symptom that makes it difficult for a stroke patient to live at home. In this review paper, different types of vascular cognitive impairment are iscussed, with emphasis on cognitive impairment related to lacunar strokes (LACS). Symptoms, diagnostics, epidemiology, treatment and prognosis are surveyed. LACS are often associated with leukoaraiosis, which is related to subcortical ischaemic vascular dementia. Even if LACS often are mild, they may therefore be associated with cognitive impairment in the longer term.