Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip terminates approximately 4 .8 cm from the carina . Orogastric tube tip courses below the left hemidiaphragm , off the inferior borders of the film . The patient is status post median sternotomy and CABG . The aorta appears diffusely dilated and tortuous , but remains unchanged . There is mild pulmonary vascular congestion . Bibasilar airspace opacities may reflect atelectasis but infection is not excluded . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Standard positioning of the endotracheal and orogastric tubes . 2 . Bibasilar opacities may reflect atelectasis but infection is difficult to exclude . 3 . Mild pulmonary vascular engorgement .