Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are unremarkable . Surgical clips project over the mediastinum . Sternotomy sutures are midline and intact . Prosthetic heart valve is evident , likely mitral valve . Lungs are clear . No pleural effusion or pneumothorax evident . Minimal degenerative changes are noted at the right acromioclavicular joint .
    OUTPUT:
    
Unremarkable cardiomediastinal contour . Lungs are clear .