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Figure 12a. Symmetric surfactant effect in a 36-week-gestationalage infant of a diabetic mother. (a) Pretreatment radiograph shows diminished lung expansion, diffuse bilateral reticulogranular opacities, and air bronchograms, findings consistent with severe RDS. (b) Repeat radiograph, obtained 6 hours after endotracheal administration of one dose of surfactant, reveals marked improvement in lung aeration and vascular definition.