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FIG 3. Asymmetric ICA flow. Images show opacified slipstreams entering the aneurysm neck and swirling within the aneurysm, with flow in the right ICA being twice that of flow in the left ICA. Although there is flow in both the ACAs and MCAs, for purposes of comparison with figure 4, individual slipstreams that primarily flow into the ACAs from the ICAs were opacified.
A, Image obtained 0.5 second before that shown in B.
B, Image obtained 0.5 second after that shown in A. Note the rapid run-off of dye within the right ICA compared with the left ICA.
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