Thus, an impaired angular vestibulo-ocular reflex (aVOR) may be found if the vestibular nuclei are affected. Severe occlusion of this artery or to vertebral arteries could lead to Horner's Syndrome as well. The infarcted area in Wallenberg syndrome is supplied by the posterior inferior cerebellar artery (PICA) usually secondary to atherothrombosis of the vertebral artery (80), or posterior inferior cerebellar artery. Background: Lateral medullary stroke (LMS) results in a characteristic pattern of brainstem signs including ocular motor and vestibular deficits. The medial branch continues backward to the notch between the two hemispheres of the cerebellum while the lateral supplies the under surface of the cerebellum, as far as its lateral border, where it anastomoses with the anterior inferior cerebellar and the superior cerebellar branches of the basilar artery.īranches from this artery supply the choroid plexus of the fourth ventricle.Ī disrupted blood supply to posterior inferior cerebellar artery due to a thrombus or embolus can result in a stroke and lead to lateral medullary syndrome. It winds backward around the upper part of the medulla oblongata, passing between the origins of the vagus nerve and the accessory nerve, over the inferior cerebellar peduncle to the undersurface of the cerebellum, where it divides into two branches. The PICA supplies blood to the medulla oblongata the choroid plexus and tela choroidea of the fourth ventricle the tonsils the inferior vermis, and the inferior parts of the cerebellum. ![]() Blockage of the posterior inferior cerebellar artery can result in a type of stroke called lateral medullary syndrome. It is one of the three main arteries that supply blood to the cerebellum, a part of the brain. This list includes dominant and non-dominant MCA infarction, medial and lateral medullary syndromes, anterior and posterior cerebral artery syndromes and the basilar artery syndrome. Also, PICA disease was seen to be more frequently related to cardiogenic embolism as compared to other causes. The posterior inferior cerebellar artery ( PICA) is the largest branch of the vertebral artery. There is a list of 'classical' stroke syndromes arranged by arterial terriotry, which one needs to commit to memory. Lateral medullary syndrome (LMS), also called Wallenberg syndrome or posterior inferior cerebellar artery syndrome results from a vascular event in the lateral part of the medulla oblongata.
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