Extradural origin of the posteroinferior cerebellar artery: an anatomic study with histological and radiographic correlation

Neurosurgery
E SalasL N Sekhar

Abstract

The posteroinferior cerebellar artery (PICA) usually arises from the intradural segment of the vertebral artery (VA). The extradural origin of the PICA is infrequent. Its preoperatory identification is important in surgical strategy during the exposure of the VA. During an anatomic prosection, the VA was exposed at the craniocervical junction in cadaveric adult specimens. The extradural origin of the PICA was encountered bilaterally in one specimen and on one side in a second specimen. An anatomic study with histological and radiographic correlation was performed. Perforating branches originate from the PICA. They supply the middle and inferior third of the olive and the lateral aspect of the medulla. The PICA has cortical branches that lead to the cerebellum. Injury to the PICA can produce an infarction of these neural structures that can be asymptomatic or cause major neurological deficits. Radiographic results obtained using a lateral projection provided the most reliable delineation of the extradural origin of the PICA. When this artery originates at, or posterior to, the posterior aspect of the occipital condyle, an extradural origin is likely. Bilateral selective vertebral angiography should be performed with special atte...Continue Reading

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Citations

Jun 22, 2005·European Radiology·Keng Yeow TayJonathan H Gillard
Nov 4, 2000·Journal of Neurosurgery·M A StoodleyB Weir
Jan 15, 2008·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·H UcerlerM Zileli
May 4, 2000·Journal of Neurosurgery·I M Ziyal, E Salas
Sep 26, 2013·Surgical and Radiologic Anatomy : SRA·Yeliz Pekcevik, Ridvan Pekcevik

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