Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . There is no focal airspace opacity , large pleural effusion or pneumothorax . The heart is not enlarged . The mediastinal and hilar contours are normal . The aortic knob is calcified . A right humeral prosthesis is partially imaged .
    OUTPUT:
    
No acute cardiopulmonary abnormality .