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Fig 2. Left anterior oblique views of a rotational angiogram and 3D streamlines of the silicon middle cerebral artery (MCA) aneurysm. B is stereoscopic 3D streamlines corresponding the systolic phase. C shows hemodynamics of B by arrows.
A, A left anterior oblique view of surface rendering of rotational digital subtraction angiogram of the right internal carotid artery shows M1 segment of right MCA (white arrow) and two M2 segment (anterior trunk of MCA [white small arrow] and posterior trunk of MCA [white arrowhead]) very clearly. Black arrows indicate the bleb.
B, Blood flow from the M1 segment of MCA strikes the posterior wall of the intracranial aneurysm. Blood flow flows along the wall of the intracranial aneurysm (the highest flow rate, 15 cm/s) and diverges into the two M2 segments near the inlet of the aneurysm. A helical flow at the left aspect of the aneurysm is seen along the aneurysmal wall. Where the helical flow reverses direction is coincident with the bleb (shown by arrows in Fig 2A). Flow rate of the bleb is low (less than 5 cm/s). Numbers and colors correspond with flow rate in the legend at the right side of the figure regarding 3D streamlines. Units are meters per second.
C, Arrows indicate flow schematically.
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