Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increasing left - sided opacification involving the mid to lower lung , probably reflecting increased pleural effusion with associated parenchymal opacity , which is most often due to atelectasis although not specific . There is also a small new right - sided pleural effusion . Pulmonary vascularity is slightly prominent in the upper lungs , suggesting pulmonary venous hypertension , although without frank congestive heart failure . The patient is status post sternotomy and the heart appears again enlarged .
    OUTPUT:
    
Increasing opacification of the left hemithorax , probably reflecting an increasing pleural effusion .