PMC5790670_01
CT scan of the chest with lung window settings at the level of the lower lobes, showing a soft-tissue density nodule located in the left lower lobe and surrounded by a halo of ground-glass opacity (the halo sign).
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PMC5790670_01_1806-3713-jbpneu-43-01-00004-gf1.jpg
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A CT scan of the chest showed a nodule with the halo sign in the left lower lobe (Figure 1).