Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest provided . Midline sternotomy wires and prosthetic cardiac valves are noted as well as a metallic stent projecting over the right upper lung . There is a small amount of blunting at the CP angles bilaterally which is stable and could represent chronic effusions or pleural thickening . There is stable retrocardiac linear density which is most compatible with scarring . There are no definite signs of pneumonia or CHF . No pneumothorax is seen . The cardiomediastinal silhouette is stable . Bony structures appear intact , though diffusely sclerotic , which could reflect renal osteodystrophy .
    OUTPUT:
    
No acute findings in the chest . Stable blunting of the CP angles likely indicates trace chronic effusions or pleural thickening .