Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Thoracolumbar scoliosis is again seen . There is no focal consolidation , pleural effusion , or evidence of pneumothorax . Linear streaky left base retrocardiac opacity on the frontal view without clear correlate on the lateral view , most likely represents atelectasis . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
No acute cardiopulmonary process .