Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP chest radiograph was obtained . Aeration of both lungs has improved since the preceding series of radiographs , most recently from ___ : 50 . There is residual airspace opacity at both lung bases . The hila are indistinct and there is peribronchial cuffing . The left hemidiaphragm is obscured by retrocardiac opacity . There are no abnormal cardiac or mediastinal contours .
    OUTPUT:
    
Appearance and progression of bibasilar airspace opacities compatible with improving pulmonary edema .