Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are unchanged . A nasogastric tube is in - situ . There are multifocal airspace opacities , unchanged in appearance . The left retrocardiac and basal opacity has improved . The left small pleural effusion has also decreased . The heterogeneous upper lobe opacities are stable . Small left pleural effusion . No pneumothorax seen .
    OUTPUT:
    
The left retrocardiac and basal opacity has improved . The left small pleural effusion has also decreased . Remaining multifocal opacities in the upper lobes a right middle lobe are stable .