Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Aorta is tortuous without change . Bibasilar linear atelectasis has improved since ___ radiograph . However , on the lateral view , there is an increased opacity overlying the lower thoracic spine , which represents a change from a baseline lateral radiograph of ___ . This is not definitively localized on the frontal radiograph , but is probably in the right retrocardiac area . There are no pleural effusions . Mild elevation of right hemidiaphragm is unchanged .
    OUTPUT:
    
Possible early right lower lobe pneumonia . Followup chest radiographs are suggested to document resolution .