Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated similar to prior . There are no focal opacities . The cardiomediastinal silhouette and hilar contours are normal . On the lateral view the left posterior costophrenic sulcus is blunted , possibly a small pleural effusion or pleural thickening . The mitral anulus is chronically heavily calcified . There is no large pneumothorax .
    OUTPUT:
    
Mild blunting of the posterior left costophrenic sulcus may represent small pleural effusion or pleural thickening . No acute intrathoracic process otherwise noted .