Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the CXR on ___ , the left lung base opacity is more prominent . There is a definite left - sided pleural effusion with adjacent atelectasis ; however , can not exclude an underlying pneumonia or pulmonary infarction in this region . The right lung is free of consolidations or large pleural effusions . No pneumothorax bilaterally . The right internal jugular catheter is unchanged in position , terminating in the cavoatrial junction . Median sternotomy wires are unchanged . The mediastinum and hila are within normal limits . Heart size is within upper limits of normal . No acute osseous abnormalities .
    OUTPUT:
    
Worsening opacification of the left lung base , due to left - sided pleural effusion with atelectasis . However , can not exclude underlying pneumonia or pulmonary embolism . Recommend clinical correlation .