Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low inspiratory volumes . The patient is status post sternotomy , with multiple surgical clips . Mild prominence of the cardiomediastinal silhouette is stable . There is minimal patchy opacity at the left base , which is similar to the earlier film and may represent atelectasis and / or and postoperative changes . Minimal blunting of the left costophrenic angle noted . No gross effusion . There is upper zone redistribution with mild vascular blurring , also similar to the prior film , allowing for technique . Right hemidiaphragm is again noted to be elevated .
    OUTPUT:
    
Mild vascular plethora and minimal patchy opacity at left base unchanged . No gross effusion .