Pulmonary arteriovenous fistulas are a very infrequent illness. The majority of these cases are associated with hereditary haemorrhagic telangiectasia, therefore their isolated presentation is exceptional. We present a patient that was diagnosed of two arteriovenous fistulas non associated with hereditary haemorrhagic telangiectasia. His main symptom was progressive dyspnea on exertion, with cyanosis and clubbing. His evolution after surgery was satisfactory. Theirs clinical, diagnosis and therapeutic peculiarities ware discussed.