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Figure 11b.   Arteriovenous malformation in a 34-year-old man with hereditary hemorrhagic telangiectasia. (a) Close-up posteroanterior radiograph of the right lung shows a lobulated, well-marginated nodule in the lower lobe (arrows). (b) Chest CT scan demonstrates a feeding artery (arrow) and an enlarged draining vein (arrowhead). (c) CT scan shows the nidus of the malformation. (Figure 11b and 11c reprinted, with permission, from reference 16.) (d) Pulmonary angiogram helps confirm arteriovenous malformation. Note the early draining vein (arrows).