Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormalities seen . Several ossific densities are noted about the right acromioclavicular joint , likely the sequela of previous injury . Mild degenerative changes are also noted involving the left acromioclavicular joint and within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .