Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is stable . Lung volumes are slightly low . Increased perihilar opacities may be accentuated by the technique but the indistinctness of the more distal pulmonary vessels is suggestive of mild edema . Retrocardiac opacitiesmay likely represent a combination of edema and atelectasis however superimposed consolidation can not be excluded . There is no large pleural effusion or pneumothorax . Bones and the upper abdomen are grossly unremarkable .
    OUTPUT:
    
1 . Interval development of mild pulmonary interstitial edema . 2 . Increased retrocardiac opacification may relate to a combination of edema atelectasis however superimposed consolidation can not be excluded .