<unk>  is a condition in which the circulation to the cerebellum is impaired due to a lesion of the superior<unk>  artery, anterior inferior<unk>  artery or the posterior inferior<unk>  artery.
Cardinal signs include vertigo, headache, vomiting, and ataxia.<unk>  strokes account for only 2-3% of the 600 000 strokes that occur each year in the United States. They are far less common than strokes which occur in the cerebral hemispheres. In recent years mortality rates have decreased due to advancements in health care which include earlier diagnosis through MRI and CT scanning. Advancements have also been made which allow earlier management for common complications of<unk>  stroke such as brainstem compression and hydrocephalus.
Research is still needed in the area of<unk>  stroke management; however, it has been proposed that several factors may lead to poor outcomes in individuals who suffer from<unk>  stroke. These factors include:
Cerebellar stroke syndrome
Paraneoplastic cerebellar degeneration
Lateral medullary syndrome
Central pontine myelinolysis
Chiasmal Syndrome
Anton-Babinski syndrome
Diencephalic syndrome
Watershed stroke