Pulmonary arteriovenous malformations are rare anomalies with most patients being asymptomatic.

PAVM can cause dyspnea due to right to left shunt.

All PAVM have an afferent supply usually from the pulmonary artery.

Once diagnosed patient should be treated. Therapeutic options include angiographic embolization with metal coil/balloon occlusion. 

PAVM enlarge over a period of time and the morbidity is up to 50% if left untreated.