Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated with bibasilar atelectasis . There is a persistent small left pleural effusion with left lower lobe opacity , unchanged since prior examination . Stable mild cardiomegaly . Mediastinal contour and hila are unremarkable . Patient is status post thoracic spine fusion with multiple surgical screws , vertical rods , and intervertebral disc spacers which is unchanged since prior examination . Right Port - A - Cath tip is within the right atrium .
    OUTPUT:
    
1 . Persistent small left pleural effusion with slowly progressive left lower lobe opacity may represent atelectasis or pneumonia in the appropriate clinical setting . 2 . Right lower lobe atelectasis .