Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show right lower lobe opacity , with a small right pleural effusion . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . Sternal wires are intact . Thoracic spinal fusion device is partially imaged .
    OUTPUT:
    
Right lower lobe opacity with an associated effusion could represent atelectasis or pneumonia .