Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear bibasilar opacities most likely represent atelectasis . No new opacity concerning for pneumonia . No , pulmonary edema , pleural effusion or pneumothorax identified . The heart is enlarged and there is evidence of prior surgery . The aorta is ectatic .
    OUTPUT:
    
No acute intrathoracic process .