Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates mild interstitial edema . Patchy bilateral parenchymal opacities are noted , and may be related to underlying edema , though focal pneumonia is certainly possible . Biapical scarring is chronic . Re - demonstrated are prominent loops of what appear to be colon in the upper abdomen .
    OUTPUT:
    
Mild interstitial edema . Bilateral parenchymal opacities which are worse since prior could be in part due to infection . If patient is amenable , PA and lateral may help further characterize .