Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is minimal left base atelectasis . No focal consolidation or pleural effusion or evidence of pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . There are mild degenerative changes of the spine . Possible nondisplaced old left posterior lateral 6th rib fracture .
    OUTPUT:
    
No acute cardiopulmonary process .