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Figure 25: Axial CT scan through the mediastinum shows extensive calcifications in the mediastinal and hilar lymph nodes. Calcification also is visible within one parenchymal nodule in the left midzone (arrow) with a peribronchovascular distribution. These changes of lung parenchymal calcification and eggshell nodal calcifications may be seen in silicosis, but this pattern of calcification is typically located more posteriorly and the upper lobes and not usually in the hilar location. Image courtesy Khan et al. eMedicine

Figure 25: Axial CT scan through the mediastinum shows extensive calcifications in the mediastinal and hilar lymph nodes. Calcification also is visible within one parenchymal nodule in the left midzone (arrow) with a peribronchovascular distribution. These changes of lung parenchymal calcification and eggshell nodal calcifications may be seen in silicosis, but this pattern of calcification is typically located more posteriorly and the upper lobes and not usually in the hilar location. Image courtesy Khan et al. eMedicine