Abstract
A 16-year-old boy presented with back pain. He had no medical history. Physical examination found a cyanotic lip, clubbing, a right-anterior thrill at auscultation, but no dyspnea. Chest roentgenogram (Fig 1, left panel) and computed tomography (CT) imaging (Fig 1, right panels) revealed a contrast-enhanced mass of the middle lobe, corresponding to a giant arteriovenous fistula (9 × 7.5 × 6 cm). On a 3-dimensional CT scan (Fig2,Fig 3), a 1.6 cm-diameter-dystrophic arterial (DA) branch of the middle lobe artery and a 2 cm-diameter-dystrophic venous (DV) branch of the middle lobe vein were well identified.
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