WEB Occlusion Scale (WOS)

Last revised by Yuranga Weerakkody on 3 Sep 2020

Citation, DOI, disclosures and article data

Citation:

Gajera J, Weerakkody Y, Murphy A, WEB Occlusion Scale (WOS). Reference article, Radiopaedia.org (Accessed on 19 Apr 2024) https://doi.org/10.53347/rID-81685

DOI:

https://doi.org/10.53347/rID-81685

Permalink:

https://radiopaedia.org/articles/81685

rID:

81685

Article created:

1 Sep 2020, Jay Gajera ◈

Disclosures:

At the time the article was created Jay Gajera had no recorded disclosures.

View Jay Gajera's current disclosures

Last revised:

3 Sep 2020, Yuranga Weerakkody ◉

Disclosures:

At the time the article was last revised Yuranga Weerakkody had no recorded disclosures.

View Yuranga Weerakkody's current disclosures

Revisions:

4 times, by 3 contributors - see full revision history and disclosures

Synonyms:

WEB Occlusion Scale

The WEB Occlusion Scale (WOS) is a standardized angiographic assessment scale for reporting aneurysm occlusion achieved with endosaccular flow disruptors such as the Woven EndoBridge^TM.

It is based on the modified Raymond–Roy occlusion classification, and can be employed to assess the adequacy of treatment. The grading system has been validated to have a reliable interobserver agreement.

WOS A: complete occlusion without an angiographically visible collection of contrast within the marker recess.
WOS B: complete occlusion with an angiographically visible collection of contrast within the marker recess.
WOS C: residual neck filling is indicated by contrast opacification of the aneurysm neck extending beyond the expected bounds of the marker recess.
WOS 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.