Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Bibasilar atelectasis . Patchy left retrocardiac opacity could be due to atelectasis or consolidation . No pleural effusion or pneumothorax . Mild cardiomegaly is stable . No rib fractures are identified .
    OUTPUT:
    
Bibasilar atelectasis . Patchy left retrocardiac opacity could be due to atelectasis or consolidation . No definite rib fracture is seen ; however , if high clinical concern for such , rib series is more sensitive and should be considered .