Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The left lower lung airspace opacity is less prominent . There are no new opacities or consolidations . Lung volumes are low . There is no pneumothorax . The heart and mediastinum are magnified by the projection . A moderate hiatal hernia is again noted .
    OUTPUT:
    
Decreasing left basilar airspace opacity may be due to resolving aspiration or infection . Moderate hiatal hernia .