Fig. 3. A 49-year-old female patient with hereditary hemorrhagic telangiectasia who had a mediastinal arteriovenous malformation.

A. Chest radiograph shows no definite abnormality. B, C. Axial contrast-enhanced CT images with lung and mediastinal window settings demonstrate prominent draining veins (double arrows) at the periphery of the right middle lobe and along the mediastinal pleura (arrows). D, E. Selective angiograms of the truncus anterior (white arrow) and right interlobar pulmonary artery (black arrow) show no discernible vascular abnormalities. F, G. Feeding arteries originate from the hypertrophied right internal mammary and inferior phrenic arteries. Note also the large draining vein (arrowheads), which communicates with the right pulmonary artery (arrow). A nidus is seen at the beginning of the draining veins.