Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph obtained . AICD is unchanged . Sternotomy closure device and mediastinal clips are also stable from prior . There is no convincing sign of pneumonia or CHF . No large effusion or pneumothorax . Heart and mediastinal contour appear stable . Bony structures appear grossly intact .
    OUTPUT:
    
No acute findings .