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Left invalidating GN caused by a posterior inferior cerebellar artery (PICA) loop in an 80-year-old otherwise healthy female patient. Fusion of 3D T2 and TOF angiography sequences (A, axial; B, coronal oblique) reveals displacement of CN IX (white arrows) and contact between the TZ of CN IX and the left PICA (arrowheads). Right CN IX is indicated by a black arrowhead.
