Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left pectoral pacemaker with the leads in satisfactory position within the right atrium and right ventricle . Linear opacities at the bilateral bases are most likely atelectasis . There is no pulmonary edema . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal . The right hemidiaphragm is mildly elevated in comparison to the left .
    OUTPUT:
    
Satisfactory position of the left - sided pacemaker and its leads . No pneumothorax . Basilar opacities likely atelectasis .