Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient remains intubated . An orogastric tube courses into the stomach , it s tip not imaged . An introducer catheter again resides in the left internal jugular vein . The patient is status post coronary artery bypass graft surgery . A left - sided chest tube is unchanged . A portion of the left lung base is excluded . Hazy background opacification suggests mild vascular congestion . Small layering pleural effusions are suspected . Increasing retrocardiac opacification is non-specific but is most commonly due to atelectasis following cardiac surgery . There is no pneumothorax .
    OUTPUT:
    
Improvement in aeration of the right upper lobe , but increased left basilar opacification , commonly due to atelectasis .