Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged with the heart size within normal limits . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is present . Mild degenerative changes are noted in the thoracic spine . Partially imaged is a right shoulder arthroplasty .
    OUTPUT:
    
No acute cardiopulmonary abnormality .