Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Vagal stimulator device projects over the left chest wall with catheter extending to the left neck region . The lung volumes are quite low , which limits evaluation primarily in the lung bases . There is bronchovascular crowding and probable mild atelectasis in the lung bases , likely accounting for the subtle opacity noted in this region . No obvious evidence of pneumonia in the lower lungs . No effusion or pneumothorax . Mid upper lungs are clear . Heart and mediastinal contour appears grossly stable . Bony structures are intact .
    OUTPUT:
    
Lower lungs poorly assessed without clear signs of pneumonia or CHF . Please note evaluation limited due to low lung volumes .