Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and endovascular stent graft repair of the thoracic aorta at the level of the aortic arch due to a saccular aneurysm . Mediastinal contour appears unchanged . Heart size is mildly enlarged though difficult to definitively delineate due to the presence of a moderate - sized left pleural effusion . Small right pleural effusion is also unchanged . Bibasilar airspace opacities likely reflect compressive atelectasis . No pulmonary edema or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Unchanged exam compared to 1 day previously with continued moderate left and small right pleural effusions and bibasilar atelectasis .