Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large left mid-to - lower lung / perihilar opacity is worrisome for pneumonia . This appears even more prominent as compared to the prior study earlier the same date . An underlying component of aspiration or hemorrhage is not excluded . Slight reticulation at the right lung base could be due to chronic changes . No pneumothorax . The cardiac silhouette is enlarged . The mediastinum is unremarkable . Patient is status post median sternotomy and CABG .
    OUTPUT:
    
Large left - sided consolidation is worrisome for pneumonia ; given interval increase in the last few hours , overlying hemorrhage or edema not excluded .