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Figure 3: Histomorphology, immunohistochemistry and Prussian blue staining of macrophages in dermatomyositis-associated RPILD. CD68+ macrophages forming conspicuous clusters in alveoli (a) and displayed the characteristic morphology of “lipid-laden” macrophages (b). A faint bluish discoloration of cytoplasmic particles observed after Prussian blue staining indicated the presence of iron-binding macromolecular structures (c). Magnification x60, bar length: 20 μm

Figure 3: Histomorphology, immunohistochemistry and Prussian blue staining of macrophages in dermatomyositis-associated RPILD. CD68+ macrophages forming conspicuous clusters in alveoli (a) and displayed the characteristic morphology of “lipid-laden” macrophages (b). A faint bluish discoloration of cytoplasmic particles observed after Prussian blue staining indicated the presence of iron-binding macromolecular structures (c). Magnification x60, bar length: 20 μm