Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable semi-erect frontal chest radiograph demonstrates a heart which is top - normal in size , unchanged . There are again prominent interstitial markings , as before . New indistinctness of the vessels is suggestive of mild pulmonary edema , with mild retrocardiac opacity obscuring the descending aorta . This is most likely due to left lower lobe volume loss . There is no definite focal consolidation or pneumothorax .
    OUTPUT:
    
Mild pulmonary edema , new . Mild retrocardiac opacity likely due to left lower lobe volume loss , without definite focal consolidation .