Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright view the chest . Midline sternotomy wires noted . Heart size is normal . The lungs are clear . There is no pneumothorax or pleural effusion . No signs of congestion or edema . Mediastinal contour is normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .