Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Mild left mid lung opacity is again seen and suggestive of scarring and presence on prior CT . Ther is no large effusion . Cardiac silhouette is enlarged but stable . Aortic valve replacement is again seen . No acute osseous abnormalities detected .
    OUTPUT:
    
No definite acute cardiopulmonary process .