Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear and lung volumes are normal . No pleural effusion , pneumothorax or focal airspace consolidation . The mediastinal and hilar structures are unremarkable . Heart size is normal . Subtle irregularity of the lateral left 6th rib may relate to prior trauma .
    OUTPUT:
    
No acute cardiopulmonary process .