Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . There is a small nodular focus projecting over the left mid lung , although likely a summation artifact or focus of sclerosis along the end of the left third rib . The lungs appear otherwise clear .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Small apparent nodular opacity , probably artifact ; repeat radiographs with AP and lateral technique are recommended when clinically appropriate to reassess .