Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well - expanded and clear . Cardiomediastinal and hilar contours are unremarkable . No pneumothorax , pleural effusion , or consolidation . A curvilinear opacity projecting over the left heart on the AP view is not visualized on the lateral projection . This is likely either within a rib or on the patient 's skin .
    OUTPUT:
    
No acute cardiopulmonary process seen .