====== Modified Raymond-Roy Occlusion Classification ======

{{rss>https://pubmed.ncbi.nlm.nih.gov/rss/search/1RIspYzP7yk_paKJVgMvO0YfSCwubutUVg4e2NZq85iUmJwwHt/?limit=15&utm_campaign=pubmed-2&fc=20240403144437}}

Mascitelli et al. 
((Mascitelli JR, Moyle H, Oermann EK, Polykarpou MF, Patel AA, Doshi AH, Gologorsky Y, Bederson JB, Patel AB. An update to the Raymond-Roy Occlusion Classification of intracranial aneurysms treated with coil embolization. J Neurointerv Surg. 2015 Jul;7(7):496-502. doi: 10.1136/neurintsurg-2014-011258. Epub 2014 Jun 4. PMID: 24898735.))
in [[2015]] proposed a modified [[Raymond-Roy Occlusion Classification]] (MRRC) or modified Montreal scale, where class III is subdivided to reflect [[progression]] to [[occlusion]]:

class IIIa: contrast [[opacification]] within the [[coil]] interstices of a [[residual aneurysm]]

class IIIb: contrast opacification outside the coil interstices, along the residual [[aneurysm wall]]

The study from Mascitelli et al. found that class IIIa aneurysms progress to complete occlusion more than class IIIb aneurysms.

A [[validation study]] by Stapleton et al. confirmed that the predictive capability of the RROC was improved by the MRRC, showing not only that IIIa occluded more often (53.6% vs 19.2%) but that IIIb lesions would also further recanalize more frequently (65.1% vs 27.4%)
((Stapleton CJ, Torok CM, Rabinov JD, Walcott BP, Mascitelli JR, Leslie-Mazwi TM, Hirsch JA, Yoo AJ, Ogilvy CS, Patel AB. Validation of the Modified Raymond-Roy classification for intracranial aneurysms treated with coil embolization. J Neurointerv Surg. 2016 Sep;8(9):927-33. doi: 10.1136/neurintsurg-2015-012035. Epub 2015 Oct 5. PMID: 26438554.))