Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright chest radiograph is obtained . Midline sternotomy wires and prosthetic cardiac valve again noted . External pacing leads project over the heart . Moderate elevation of the right hemidiaphragm appears grossly stable . No signs of pneumonia or CHF . No large pleural effusions are seen . Overall , cardiomediastinal silhouette appears stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process . Stable elevated right hemidiaphragm .