![]() Note: occasionally, a small vertebral artery will terminate into a common AICA-PICA complex. The posterior inferior cerebellar artery gives off the following arteries: Supplies the vermis and adjacent hemisphere The main trunk of the posterior inferior cerebellar artery usually bifurcates somewhere along the margin of the cerebellar tonsil into Supplies branches to the cerebellar surface Marks the transition between the proximal (medulla-supplying) and distal (cerebellum-supplying) parts of the posterior inferior cerebellar arteryĬourses in the cleft between the tela choroidea, inferior medullary velum rostrally, and superior pole of the cerebellar tonsil caudallyĬontains the cranial loop, also known as the choroid point or choroid arch, an upward convex loop that has a constant relation to the 4 th ventricle and gives rise to choroidal arteries Variably courses (ascending or descending) along the side of the medulla near or between the origins of the 9 th, 10 th, and 11 th cranial nerve rootsĬourses along the posterolateral surface of the medulla and inferior cerebellar tonsilĬontains the caudal loop, a downward convex loop that mostly remain superior to the foramen magnum but occasionally extend below it PCA posterior cerebral arteries PICA posterior inferior cerebellar arteries. 6,7:Ĭourses along the front of the medulla at the level of the inferior olive (C) Vertebral artery hypoplasiaVertebral artery hypoplasia (usually dened as arterial diameter < 2.0 mm) is unilaterally present in approximately 15 of the population but in patients with PICA strokes, it is usually ipsilateral to the smaller artery. The segmental anatomy was defined microsurgically by Lister et al. This type of stroke typically affects only one side or section of the cerebellum. Occasionally arises from a common origin with the anterior inferior cerebellar artery It occurs when a blood vessel is blocked or bleeding, causing complete interruption to a portion of the cerebellum. ~20% arise extracranially, inferior to the foramen magnumġ0% arise from the basilar rather than vertebral artery The superior cerebellar artery (SCA) arises from the distal basilar artery, just below the posterior cerebral artery (PCA) and typically supplies: whole superior surface of the cerebellar hemispheres down to the great horizontal fissure. The PICA is a paired artery that originates from the vertebral artery V4 segment. Isolated superior cerebellar artery (SCA) infarc-tion is rare,1-8 and the mechanism is often notreadily apparent.4 We report the case of a youngman with vertebral artery (VA) dissection associatedwith ipsilateral SCA territory infarction diagnosedclinically and by computed tomography (CT).
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