Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacemaker is new since the ___ exam , projecting leads appropriately into the right atrium and ventricle . The heart size is normal . The hilar and mediastinal contours are unchanged . There is no pneumothorax , focal consolidation , or pleural effusion . Linear left basilar opacities are most compatible with atelectasis .
    OUTPUT:
    
Left pacemaker projecting leads into the right atrium and ventricle .