Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs were acquired of the chest . The lungs are clear . The cardiac and mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen . Bilateral degenerative changes of the acromioclavicular joints are noted .
    OUTPUT:
    
No acute cardiac or pulmonary process .