A 22-year-old man came with breathlessness on exertion and bluish discolouration of lips.
Frontal and lateral chest radiographs show a well-defined, oval, non-calcified soft tissue opacity in the right middle lobe surrounded by areas of airspace opacification.
Contrast enhanced CT scan of the chest shows a well-circumscribed, enhancing tubular lesion with a feeding artery, aneurysmal sac and a draining vein.