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Figure 4. Lung biopsy specimen, showing (a) massive infiltration of alveoli by foamy histiocytes (HE, x 40), (b) massive infiltration by histiocytes which stain sea-blue (arrows) with May-Grünwald Giemsa ( x 200), (c) moderate fibrosis (arrows) of alveolar walls and interlobular septae (Masson-Goldner, x 100) and (d) ultrastructural examination, showing (left) the sea blue histiocytes with numerous dense granules (arrows), which correspond to secondary lysosomes with abundant myelin figures (right).
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