Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The appearance of the mediastinum is unchanged , accounting for differences in technique . There is no pleural effusion , pneumothorax or focal airspace consolidation . Bibasilar atelectasis is present . The heart size is normal . The hilar structures are unremarkable .
    OUTPUT:
    
Unchanged , normal - appearing mediastinum .