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H&E staining at magnification ×100 (A) and ×200 (B) of the lung biopsy specimen revealing filling of the alveolar spaces with amorphous material and the preservation of the interstitial architecture without inflammation. Electron microscopy (C) reveals numerous alveolar cells showed abundant concentrically multilamelated phospholipid structures (lamellar bodies) and tubular myelin, widely distributed in the cell cytoplasm.
