====== Riles classification ======

{{riles_classification.jpg?400}}

Type 1A involves a patent ICA and ECA

Type 1B a patent ECA and an occluded ICA

Type 1C a patent ICA and an occluded ECA

Type 2 involves a total CCA, ICA and ECA occlusion
((Riles TS, Imparato AM, Posner MP, Eikelboom BC. Common carotid occlusion.
Assessment of the distal vessels. Ann Surg. 1984 Mar;199(3):363-6. PubMed PMID:
6703797; PubMed Central PMCID: PMC1353406.
)).