Hereditary angioneurotic oedema.

HAE is transmitted by an autosomal dominant gene. It is due to a defect in the complement system and should be distinguished from the other two types of angio-oedema, i.e. allergic and idiopathic types. Pathogenesis and treatment are discussed and two new cases of HAE have been reported here. I would stress here two points: first, that the family should be investigated for the possibility of HAE; secondly, that the patient should carry a medical card similar to those carried by haemophilic patients, containing the diagnosis, name of the G.P. and emergency treatment.