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a showed a1.0 × 0.8 cm nodule (black arrow) in the subpleural area of the posterior segment of the upper lobe of the right lung, with unclear boundaries, no obvious lobulation or burr signs, and no calcification. b showed a 1.2 × 0.9 cm nodule (black arrow) in the subpleural region of the dorsal segment of the right lower lobe, with lobular depression and adjacent vascular aggregation, but no obvious thickening
