<unk>  is a condition in which an abnormal connection (fistula) develops between an artery and vein in the lungs. As a result, blood passes through the lungs without receiving enough oxygen.
Pulmonary arteriovenous fistula
Pulmonary artery sarcoma
Pulmonary capillary hemangiomatosis
Iliac artery aneurysm
Aortopulmonary fistula
Pulmonary cystic lymphangiectasis
Arteriovenous fistula
Bronchopleural fistula