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A 15-year-old boy was receiving chemotherapy for osteogenic sarcoma of the left femur. A routine chest radiograph incidentally showed an azygous lobe of the lung (Panel A) with a thin fissure (arrows) separating it from the rest of the right upper lobe. As part of an evaluation for lung metastases, computed tomography of the chest was performed 2 weeks later (Panels B and C). In addition to the fissure (Panel B, white arrows) and the contrast-enhanced azygos vein (Panel C, asterisk), a small nodule, 1 cm in diameter (Panel B, black arrow) was seen in the posterior right upper lobe. . . . [Full Text of this Article] |