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. Author manuscript; available in PMC: 2014 Feb 13.
Published in final edited form as: Neurosurgery. 2012 Dec;71(6):1111–1124. doi: 10.1227/NEU.0b013e318271c081

Figure 5.

Figure 5

Cerebellar AVM, tonsillar subtype. The tonsillar AVM is a small, paramedian AVM in the tonsil, easily circumscribed in the cisterna magna by separating the tonsils, opening the cerebellomedullary fissure, and splitting the tonsillobiventral fissure. The AVM is fed unilaterally by PICA (left lateral view), which can be interrupted early in the dissection. It is drained by tonsillar and inferior vermian veins (posterior view). Abbreviations: BA = basilar artery; PICA = posterior inferior cerebellar artery; SS = straight sinus; TS = transverse sinus; Torc = torcula; IVV = inferior vermian vein; ToV = tonsillar vein; RToV = retrotonsillar vein.