Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart size remains moderately enlarged . The mediastinal and hilar contours are unchanged . There is no pulmonary edema . Small right pleural effusion which is partially loculated laterally and extends into the minor fissure is unchanged . Right basilar patchy opacity is re - demonstrated as well as 8 retrocardiac patchy opacity , all of which are similar compared to the previous exam . There is likely a small left pleural effusion . No pneumothorax is seen .
    OUTPUT:
    
Unchanged exam compared to the prior exam performed approximately 4 hours earlier . Small right pleural effusion which is partially loculated . Right basilar patchy opacity is unchanged , which could reflect atelectasis or infection . Minimal retrocardiac atelectasis is also seen and probable small left pleural effusion .