Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube ends 3 .5 cm above the carinal . A right central venous line ends at the cavoatrial junction . A transesophageal tube ends in the stomach . Postoperative atelectasis in the right lower lobe is moderately severe . The left lung is clear . There is no pleural effusion or pneumothorax . The mediastinum is markedly widened by the generally large and elongated thoracic aorta , less so by the dilated pulmonary arteries , as confirmed by the the same - day chest CTA . Heart is mildly enlarged . There is no pulmonary edema . Air beneath the chronically elevated right hemidiaphragm reflects recent abdominal surgery .
    OUTPUT:
    
Postoperative right lower lobe atelectasis . The widened mediastinum corresponds to a large elongated thoracic aorta and to lesser extent dilated pulmonary arteries . Small postoperative pneumoperitoneum .