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Acutely ruptured left vertebral dissecting aneurysm proximal to the PICA origin in a 47-year-old man (patient #3). A, Left vertebral angiogram shows dissecting aneurysm on a narrowed segment proximal to the PICA origin (arrow). B, Right vertebral angiogram after internal coil trapping of the aneurysm and dissecting aneurysm demonstrates retrograde filling of the left distal vertebral artery and PICA (arrow).
