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Figure 17b. Immature lungs in a 24-week-gestational-age neonate with a birth weight of 530 g. (a) Anteroposterior radiograph obtained on the second postnatal day shows clear lungs. (b) Repeat radiograph, obtained at 48 days, shows coarse parenchymal opacities with no regions of disordered aeration or cystic lucency, findings consistent with uniform fibrosis in "new" BPD.