Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . A left chest pacemaker has leads terminating in the right atrium and right ventricle . There is no pneumothorax . The left hemidiaphragm is chronically elevated with mild basilar atelectasis . No focal consolidation , pleural effusion , or pulmonary edema is seen . Heart size is mildly enlarged but stable . Chronic widening of the vascular pedicle secondary to an unfolded aorta is unchanged .
    OUTPUT:
    
1 . Satisfactory position of left chest pacemaker leads in the right atrium and right ventricle . 2 . Chronic left hemidiaphragm elevation with mild left basilar atelectasis .