Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two AP views of the chest . The lungs are clear without focal consolidation or large effusion . The cardiomediastinal silhouette is within normal limits for technique . Bilateral rib fractures appear old . Degenerative changes are seen at the acromioclavicular joints bilaterally .
    OUTPUT:
    
No definite acute cardiopulmonary process .