The classical triad of hereditary haemorrhagic telangiectasia (HHT, Osler-Rendu-Weber syndrome) consists of recurrent epistaxis, mucocutaneous telangiectasia, and a family history of the condition. It is an autosomal dominant condition with reported incidences in various countries of between 1 in 2500 and 1 in 8000. At least 30% of patients have pulmonary arteriovenous malformations giving rise to an increased risk of cerebral embolism and abscess. Cerebral …