Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable view of the chest . The lungs are grossly clear . Cardiomediastinal silhouette is within normal limits . Descending thoracic aorta is tortuous . No displaced fractures are identified . Degenerative changes seen at the acromioclavicular joints .
    OUTPUT:
    
No definite acute cardiopulmonary process .