Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , there is a new vagal stimulator with the generator overlying the left heart and the leads extending to the left cervical region . Lungs are clear aside from linear opacities at the lung bases , likely reflective of atelectasis . No evidence of pneumonia or developing aspiration pneumonitis . The heart size and mediastinal contours are within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process .