Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . The heart size remains normal and no configurational abnormality is noted . The entire thoracic aorta is generally widened and elongated , and this includes also the ascending portion to the right of the midline . The pulmonary vasculature is not congested and there are no signs of acute pulmonary parenchymal infiltrates . Also , the lateral pleural sinuses remain free from fluid accumulation and there is no pneumothorax in the apical area . Our records do not include a previous chest examination available for comparison .
    OUTPUT:
    
General widening and elongation of thoracic aorta compatible with the diagnosis of aortic dissection . Prominence of ascending aorta is also noted . There is no cardiac enlargement , no evidence of pulmonary congestion or pleural effusion on this preoperative single view chest examination .