Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left perihilar opacity is similar in appearance compared to the radiograph dated ___ . There is also dense opacification overlying the mid thoracic spine on the lateral , which is also unchanged . There are persistent bibasilar opacities , which may reflect atelectasis . No new focal consolidations are visualized . No pulmonary edema . No pleural effusion . No pneumothorax .
    OUTPUT:
    
1 . Persistent left perihilar opacity and dense opacification overlying the mid thoracic spine , similar in appearance compared to the prior radiograph . This is not fully characterized based on its radiographic appearance . 2 . Persistent bibasilar opacities , which may reflect atelectasis 3 . No new focal consolidations . No gross effusion .