Interobserver variability in the assessment of aneurysm occlusion with the WEB aneurysm embolisation system

We read with interest the article by Fiorella et al1 on interobserver variability in the assessment of aneurysm occlusion with the WEB aneurysm embolisation system recently published in the journal. In this study the authors evaluated the interobserver variability of the previously published Web Occlusion Scale (WOS).2 They showed substantial overall interobserver agreement and proposed that the WOS should be used as a primary angiographic endpoint in future clinical studies.

We have just completed a retrospective multicenter study addressing the safety of the use of single layer WEBs in 98 aneurysms.3 In this study we described a new classification, the Beaujon Occlusion Scale Score (BOSS), for follow-up evaluations. This score is applicable to both single and dual layer WEBs. However, unlike the WOS, the BOSS system takes into account situations where the WEB itself is still filled with contrast media. BOSS 1 corresponds...

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