Unusual manifestations of hereditary angioedema.

Hereditary angioedema is a hereditary disorder transmitted as an autosomal dominant trait, characterized by reduced plasma concentration of C1 esterase inhibitor (type 1) or the presence of non functional C1 esterase inhibitor (type 2). We describe and discuss the case of a 35-year-old man who presented two unusual clinical manifestations of type 2 hereditary angioedema causing diverse emergency situations: acute abdomen and parasellar oedema.