Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Lungs are hyperinflated . Small left apical pneumothorax appears unchanged compared to the previous radiograph . Lungs are hyperinflated without focal consolidation . Trace left pleural effusion is re - demonstrated with minimal left lower lobe atelectasis . No acute osseous abnormality is evident . .
    OUTPUT:
    
Small left hydropneumothorax , similar to the previous radiograph obtained approximately 3 hours earlier .