Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Mild atelectasis blunts the left costophrenic sulcus . The cardiomediastinal silhouette , and hilar contours are normal . There is no pleural effusion or pneumothorax . The aortic arch is calcified . There is minimal pleural thickening at the lung apices .
    OUTPUT:
    
No acute cardiopulmonary abnormality .