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Figure 4: Sections from the upper lobes showing elastic fibrosis in the sub pleural location extending into the parenchyma (blue arrows). Margins between the normal lung and affected fibrotic areas are sharply defined (orange arrow)

Figure 4: Sections from the upper lobes showing elastic fibrosis in the sub pleural location extending into the parenchyma (blue arrows). Margins between the normal lung and affected fibrotic areas are sharply defined (orange arrow)