Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . The lung volumes are low . There is no pleural effusion or pneumothorax . Patchy opacities in the lower lungs are probably due to atelectasis . Elsewhere , the lungs appear clear . A few air - fluid levels in the epigastric region are non-specific ; no dilated bowel is evident or free air .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Mild gastric distention and few nonspecific epigastric air - fluid levels .