Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and prosthetic valve again noted . Dual lead pacer device again noted with leads extending to the region of the right atrium and right ventricle . Lungs are clear without focal consolidation , large effusion or pneumothorax . Cardiomediastinal silhouette is stable and normal . Atherosclerotic calcification is mild along the aortic arch . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .