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. 2020 Jan 31;12(5):512–520. doi: 10.1136/neurintsurg-2019-015506

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Web Occlusion Scale grades A and B indicate complete occlusion (A) with or (B) without an angiographically visible collection of contrast within the marker recess. (C) Residual neck filling is indicated by contrast opacification of the aneurysm neck extending beyond the expected bounds of the marker recess. (D) Residual aneurysm filling is indicated by contrast opacification extending beyond the aneurysm neck and into the fundus, either deep to the proximal marker recess or around the periphery of the device.