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Figure 19c. Long-standing "healed" BPD, pathologic features. (a) Photomicrograph (original magnification, x30; H-E stain) demonstrates diffuse alveolar septal fibrosis within an acinus (bottom) adjacent to another acinus (top) with hyperexpanded but otherwise normal alveoli. (b) Photomicrograph (original magnification, x100; H-E stain) depicts a continuous band of hyperplastic smooth muscle (arrow) surrounding a bronchiole. (c) Photograph of the pleural surface of a lung at 1 month of age shows alternating populations of hyperexpanded and collapsed acini de-fined by irregular pseudofissures (arrows).
