Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright chest radiograph was provided . Midline sternotomy wires and mediastinal clips are again seen . Overlying EKG leads are present . The lungs are clear bilaterally without focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette appears stable and within normal limits . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .