Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation . No pleural effusion is seen . Barium initial pneumothorax seen on CT earlier today is not appreciated on radiography . . The cardiac and mediastinal silhouettes are unremarkable . Left sixth and seventh rib fractures were better seen on the prior study .
    OUTPUT:
    
No significant interval change .