Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from 1 day prior , increasing opacity in the retrocardiac and left lower lobe can be a combination of pleural fluid and atelectasis . On the lateral view , the pleural fluid has the very horizontal appearance , suggestive of hydro pneumothorax . A pleural line is not visualized on the AP view . Moderate cardiomegaly .
    OUTPUT:
    
Slight increase in left - sided hemothorax , with air - fluid level on the lateral concerning for hydro pneumothorax .