Figure 5(A-D).

Progression of radiographic findings in respiratory distress syndrome. (A) Stage 1: Fine granularity (asterisk) with few air bronchograms (arrows). (B) Stage 2: Coarse, distinct granularity (asterisks) with extensive air bronchograms (arrows). (C) Stage 3: Increasing opacity with decreasing air bronchograms and granularity. Note the vertical orientation of ribs (arrowheads) with bell shaped thorax. (D) Stage 4: “Whiteout lung”-Diffuse bilateral opacification with lack of apparent heart borders (dotted arrows) and loss of all air bronchograms