Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base opacity has increased , which most likely represents combination of pleural effusion and atelectasis , although underlying consolidation is not excluded . There are low lung volumes and increased perihilar interstitial markings suggesting mild pulmonary edema . No right pleural effusion is seen . There is no evidence of pneumothorax . The cardiac silhouette remains top - normal to mildly enlarged with evidence of left atrial enlargement . The patient is status post median sternotomy and CABG .
    OUTPUT:
    
Increased left basilar opacity most likely represents combination of pleural effusion and atelectasis , although underlying consolidation not excluded . Mild pulmonary edema .