Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Dual lead pacemaker is noted with left chest wall device and intact leads can be seen extending to the region the right atrium right ventricle . The heart is top normal in size . Overlying EKG leads are present . There is mild left basilar atelectasis . No convincing signs of pneumonia or CHF . Left CP angle is partially excluded . No large effusion is seen . Mildly unfolded thoracic aorta contains atherosclerotic calcifications . The imaged bony structures appear intact .
    OUTPUT:
    
Top normal heart size . Mild left basal atelectasis .