Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are low with lower lung opacities likely atelectasis though can not exclude pneumonia . No large effusion or pneumothorax . Heart size appears top - normal contours unremarkable . Bony structures are intact .
    OUTPUT:
    
Lower lung opacities concerning for atelectasis versus pneumonia .