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Fig 3. Posterior-anterior views of a rotational angiogram and 3D streamlines of the silicon middle cerebral artery (MCA) aneurysm. B is stereoscopic 3D streamlines corresponding with the systolic phase. C shows hemodynamics of B by arrows.
A, A posterior-anterior 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 irregular surface of the aneurysm.
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 and 2 main flows diverge into the two M2 segments near the inlet of the aneurysm. Another weak flow flows out from the anterior trunk of MCA (white small arrow in Fig 3A) from behind the central incoming jet of the M1 segment. This slow flow (yellow arrow in Fig 3C, around 5 cm/s) corresponds with the irregular surface of the aneurysmal wall (shown by black arrows in Fig 3A).
C, Arrows indicate flow schematically.
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