A disorder of angiogenesis leading to arteriovenous dilatations: cutaneo-mucosal hemorrhagic telangiectasias and visceral shunting. The disease is hereditary hemorrhagic telangiectasia (Monarch Disease Ontology identifier MONDO_0019180). Also known as: HHT, Osler hemorrhagic telangiectasia syndrome, Osler-Weber-Rendu disease, Rendu-Osler disease, Rendu-Osler-Weber disease, telangiectasia, hereditary Hemorrahagic, of Rendu, Osler, telangiectasia, hereditary hemorrhagic.