Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette , and hilar contours are normal . Minimal blunting of the left costophrenic sulcus likely reflects atelectasis . There is no pleural effusion or pneumothorax . The aorta is tortuous and calcified .
    OUTPUT:
    
Mild atelectasis blunting the left costophrenic sulcus . No convincing evidence of pneumonia .