Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left - sided pacemaker with associated right atrial and right ventricular leads is not changed in position . The lungs are clear without consolidation or edema . There is no pleural effusion or pneumothorax . Mild prominence of the upper lobe vasculature is stable . The mediastinal contours are normal . The heart is mildly enlarged , and unchanged .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of a pneumothorax .