Fig. 3

DSA images following right MCA aneurysm trapping. A Images of the third DSA procedure, performed 9 days after the right MCA aneurysm had been coiled, showing that the coiled aneurysm was completely sealed off. Three-dimensional ICA angiography and left vertebral artery angiography images confirmed the P1 section of the right PCA as normal at that time. B Images of the fourth DSA procedure, which was performed after a repeat subarachnoid hemorrhage (15 days after coiling of the right MCA aneurysm). The two- and three-dimensional DSA images reveal an enlarging dissecting aneurysm located in the P1 section of the right PCA. ACA, anterior cerebral artery; AN, aneurysm; dAN, de novo aneurysm; DSA, digital subtraction angiography; ICA, internal cerebral artery; MCA, middle cerebral artery; PCA, posterior cerebral artery