Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP radiograph of the chest . There is left lower lobe atelectasis . The lungs are otherwise clear . There is no pneumothorax or pleural effusion . The hilar and cardiomediastinal contours are normal . Pulmonary vascularity is normal . Severe degenerative changes of the bilateral glenohumeral and acromioclavicular joints are noted .
    OUTPUT:
    
No acute cardiopulmonary process .