Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . Linear left basilar opacity is seen most suggestive of atelectasis especially given elevation of the left hemidiaphragm . The lungs are otherwise clear . The cardiomediastinal silhouette is stable denoting a tortuous aorta . Degenerative changes noted at the left glenohumeral joint and bilateral acromioclavicular joints .
    OUTPUT:
    
No acute cardiopulmonary process .