Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were provided . Lung volumes are low . No convincing signs of pneumonia or CHF . There is mild linear plate - like atelectasis in the left lower lung . A vague nodular opacity in the left mid lung likely corresponds with the anterior left third rib at the site of prior injury . Heart size is stable . Mediastinal contour is normal . Bony structures appear intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute findings .