Fig. 1.
Three-dimensional models of the vascular geometries: (a) Left panel: for patient 1 the left VA was occluded proximal or distal to the left PICA in surgical options 1 and 2, respectively. (b) Right panel: for patient 2, the left PCA was clipped in option 1, both PCAs were clipped in option 2, and for option 3 the basilar apex was clipped such that only the right SCA was remained attached to the basilar trunk.