Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . Lower lung volumes are seen on the current exam . There is , however , suggestion of diffuse increased interstitial markings with more confluent opacities at the lung bases . While these could be due to impart atelectasis , underlying edema or infection is also suspected . Cardiac silhouette is unchanged , as are the osseous and soft tissue structures .
    OUTPUT:
    
Bilateral parenchymal opacities , worse at the bases , left greater than right , suggestive of underlying edema or bilateral infection superimposed on atelectasis . PA and lateral with better inspiratory effort may help further characterize .