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3DRA (white) and CE-MRA (red) 3D reconstructions are co-registered to show reconstruction errors. The neck of the supraclinoid ICA aneurysm was underestimated by CE-MRA (Panel A, arrowheads) which led to a 1% volumetric error. The MCA bifurcation aneurysm (Panel B) was poorly registered which led to an 8% volumetric error (arrow). In the second MCA bifurcation aneurysm (Panel C), the CE-MRA did not register a bleb (arrow), which led to a 12% volumetric error.
