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(a) Posteroanterior chest radiograph shows no active lesion six months earlier. (b) Posteroanterior chest radiograph shows a mass-like lesion in the left lower lung. (c) Axial non-enhanced computed tomography (CT) scan shows a CT halo sign (peritumoral ground-glass attenuation). (d) Mediastinal lymphadenopathy in the pretracheal retrocaval region.
