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DSA showing collar sign in incompletely occluded aneurysms after Pipeline embolization. Each line represents 1 aneurysm corresponding to the On-line Table. The left column shows the aneurysm before Pipeline embolization. The right column shows the residual aneurysm with the collar sign (white arrowheads) after Pipeline placement at last follow-up. For aneurysms 4 and 10, both first and second angiographic follow-up are shown.
