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FIG 2. 4D-CT angiography of large incracranial aneurysm of the left MCA, showing ECG-gated reconstruction of an intracranial aneurysm of the left MCA. The cardiac cycle was divided into 20 phases at 5% increments. During the period from 90% to 5% of the R-R interval, a small protuberance appeared at the bleb (arrow).
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