Fig 5. Patient 29: Aneurysm of the medial cerebral artery bifurcation; the black and white arrows indicate the M2 segments of the medial cerebral artery; uncertainty in preoperative rDSA interpretation of M2 segment (single broad vessel vs. 2 nearby vessels); detection of 2 M2 branches (N, P and R) in 3D-ioUS as confirmed intraoperatively; rDSA (red), 3D-ioUS (blue, glow-orange); M: pre-clipping rDSA; N: pre-clipping 3D-ioUS; O: coregistration of M+N; P,Q: MIP of 3D-ioUS; R: coregistration of R+M.
