Vertebrobasilar Insufficiency

**Definition:** Localized or diffuse reduction in blood flow through the vertebrobasilar arterial system, which supplies the BRAIN STEM; CEREBELLUM; OCCIPITAL LOBE; medial TEMPORAL LOBE; and THALAMUS. Characteristic clinical features include SYNCOPE; lightheadedness; visual disturbances; and VERTIGO. BRAIN STEM INFARCTIONS or other BRAIN INFARCTION may be associated.

**Tree numbers:** - C10.228.140.300.150.956 - C14.907.253.092.956

**Synonyms:** - Vertebro-Basilar Insufficiency - Vertebro-Basilar Ischemia - Vertebrobasilar Ischemia