Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from 1 day prior , left pigtail catheter has been removed . No visualized apical pneumothorax . Left lower lobe opacities combination small effusion and atelectasis unchanged . Mild cardiomegaly . The lungs remain hyperinflated .
    OUTPUT:
    
No appreciable pneumothorax .