Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips are again noted . The lung volumes are low with no convincing sign of pneumonia or CHF . No large effusion or pneumothorax . The heart size is top - normal . Mediastinal contour is unremarkable . Bony structures are intact .
    OUTPUT:
    
No acute findings .