Fig. 1From: Interstitial pneumonia pattern on day 7 chest radiograph predicts bronchopulmonary dysplasia in preterm infantsChest radiographs representing each grade. a No demonstrable abnormality (grade 1). b Granular infiltration (grade 2). c Diffuse streaky interstitial thickening (grade 3). d Diffuse coarse interstitial thickening (grade 4)Back to article page