Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal with calcification of the aortic knob . There has been interval placement of a left pacemaker defibrillator with single lead terminating in the right ventricle . There is no pleural effusion or pneumothorax . Stable fibrotic changes at the left lung base are again present . There is no pulmonary edema or focal consolidation concerning for pneumonia . Cholecystectomy clips are seen in the right upper quadrant .
    OUTPUT:
    
Satisfactory placement of a left single - lead pacemaker defibrillator with tip terminating in the right ventricle . No pneumothorax .