Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Subtle increase in lower lung opacities may reflect atelectasis , less likely early pneumonia . No large effusions seen . Cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
Subtle increased opacities in lower lungs likely atelectasis common less likely pneumonia .