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Histopathological sections of a surgical lung biopsy show the filling of the alveolar spaces with eosinophilic granular substances with (A, B) Hematoxylin and Eosin staining (A, magnification ×100; B, ×200), which were (C) PE 10 and (D) PAS positive (magnification ×100). These finding were consistent with PAP. PAP: pulmonary alveolar proteinosis, PAS: periodic acid-Schiff, PE 10: anti-SP-A antibody
