Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is mild elevation of left hemidiaphragm . Atelectasis is seen in the left lung base . There may be minimal chronic interstitial abnormality without focal consolidation . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette is unremarkable . No pulmonary edema is present . Severe degenerative changes are noted in the right glenohumeral joint . Degenerative changes are partially imaged in left glenohumeral joint and may be severe as well .
    OUTPUT:
    
Left basilar atelectasis . Possible chronic mild interstitial abnormality without focal consolidation .