Abnormal lung morphology Abnormality of the vasculature Pulmonary arteriovenous malformation Pulmonary arteriovenous malformation, a condition most commonly associated with hereditary hemorrhagic telangiectasia, is an abnormal communication between the pulmonary artery and pulmonary vein without an intervening capillary communication. HRCT images usually show a coarse spidery appearance of the peripheral vascular markings in the lungs. More specific findings are obtained in the pulmonary angiogram where the normally invisible capillary phase is replaced by irregular vascular channels bridging the peripheral branches of pulmonary arteries and veins. HP:0006537 HP:0002114 UMLS:C1857690 Pulmonary AV malformation Fyler:2210 HP:0006548 Abnormal cardiovascular system morphology