NCIt definition : A syndrome which occurs as a result of the occlusion of the basilar artery. It may
be caused by atherosclerosis, embolism or hemorrhage. Clinical signs include dizziness,
headache, vomiting, hemiparesis or hemiplegia, dysarthria, dysphagia, blurred vision
and loss of consciousness. The clinical course is variable and is dependent upon the
extent of the occlusion and the location of the clot along the basilar artery which
determines the resultant neurologic impairment. Prognosis is dismal in cases where
a complete occlusion occurs with rapid deterioration of neurological function.;