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Computed tomography findings late stage disease. A: Reverse halo or atoll sign: Rounded opacity in the left lung with ground-glass attenuation in the center demarcated by a denser, fine ring. Small, homogeneous rounded opacity in the right lung; B: Bilateral perilobular pattern: Polygonal (irregular, linear or band-like) peripheral opacities in secondary pulmonary lobules; C: Peripheral, elongated, curved consolidation in the right lower lobe containing dilated bronchi.
