Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear besides left basilar atelectasis . The cardiac and mediastinal contours are normal , and there is no pleural effusion or pneumothorax . Percutaneous transhepatic biliary drain is partially imaged in the midline of the upper abdomen . Old healed left posterior rib fractures are noted .
    OUTPUT:
    
No acute cardiopulmonary process .