Raymond-Roy Occlusion Classification (Coiled Aneurysm)
Derives the Raymond-Roy occlusion class (I, II, IIIa or IIIb) of a coiled aneurysm from where contrast fills on angiography.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Contrast filling of the aneurysm
- Contrast fills part of the aneurysm sac (residual aneurysm)
- Where the residual contrast sits
- Along the aneurysm wall
Result: Raymond-Roy class IIIb: residual aneurysm with contrast along the aneurysm wall.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Contrast filling of the aneurysm
- Where the residual contrast sits (class III only)
How this is calculated
Citation
Roy D, Milot G, Raymond J. Endovascular treatment of unruptured aneurysms. Stroke 2001;32:1998-2004. Mascitelli JR et al. J Neurointerv Surg 2015;7:496-502 (modified classes IIIa/IIIb). As described in Beaman C et al. Stroke Vasc Interv Neurol 2023;3:e000757. Read the sources: Roy 2001 ↗, Mascitelli 2015 ↗, Beaman 2023 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.