Displacement of the Superior Cerebellar Artery

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Abstract
Numerous studies of vertebral arteriography have established the normal positions of the individual arteries in the posterior fossa.1-3 The precise localization of expanding mass lesions by displacement and distortion of these arteries has been more difficult, however, than with displacement and distortion of the supratentorial arteries.4 Only rarely are vascular displacements in the posterior fossa of definite localizing value. One example would be the posterior displacement of the basilar artery by a mass in the region of the clivus. Many other displacements which can be noted in the vertebral arteriograms of patients with posterior fossa mass lesions are of less localizing significance. Examples of these would be the anteroposterior or midline displacement of the cranial loop of the posterior inferior cerebellar artery,5 and displacements and distortions of the posterior cerebral arteries,6 especially when due to tentorial herniation. Downward displacement of the caudal loop of the

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