Monarch Disease Ontology id MONDO_0018892 (Wyburn-Mason syndrome) or Bonnet-Dechaume-Blanc syndrome is characterized by the association of arteriovenous malformations of the maxilla, retina, optic nerve, thalamus, hypothalamus and cerebral cortex. Also known as: CAMS2, Cerebrofacial arteriovenous metameric syndrome type 2, bonnet-Dechaume-Blanc syndrome.