A spectrum of pathological conditions of impaired blood flow in the brain. They can involve vessels (ARTERIES or VEINS) in the CEREBRUM, the CEREBELLUM, and the BRAIN STEM. Major categories include INTRACRANIAL ARTERIOVENOUS MALFORMATIONS; BRAIN ISCHEMIA; CEREBRAL HEMORRHAGE; and others.

Synonyms: Disease, Cerebrovascular, Occlusions, Cerebrovascular, Vascular Disease, Intracranial, Intracranial Vascular Disorders, Vascular Disorders, Intracranial, Cerebrovascular Diseases, Intracranial Vascular Disease, Vascular Disorder, Intracranial, Vascular Diseases, Intracranial, Cerebrovascular Disorders, Cerebrovascular Insufficiency, Intracranial Vascular Diseases, Cerebrovascular Occlusion, Brain Vascular Disorder, Insufficiencies, Cerebrovascular, Brain Vascular Disorders, Intracranial Vascular Disorder, Vascular Disorders, Brain, Diseases, Cerebrovascular, Cerebrovascular Disorder, Insufficiency, Cerebrovascular, Cerebrovascular Insufficiencies, Cerebrovascular Disease, Vascular Disorder, Brain, Occlusion, Cerebrovascular, Cerebrovascular Occlusions