Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest provided . The lungs appear clear , though lung volumes are low . Midline sternotomy wires and mediastinal clips again noted with fragment at uppermost sternotomy wire . No pneumothorax or pleural effusion , though study provided is a supine image . Bony structures are intact .
    OUTPUT:
    
No acute findings in the chest .