Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . BA AICD appears unchanged in position with leads extending to the region of the right atrium and right ventricle . Midline sternotomy wires and mediastinal clips are again noted . The lungs are clear bilaterally . The cardiomediastinal silhouette appears grossly stable with top - normal heart size . No large effusion or pneumothorax . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .