Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are somewhat low , with elevation of the left hemidiaphragm with a large gastric bubble and air-filled loops of bowel in the left upper quadrant . Mild atelectasis is present at the left lung base . The heart is top - normal in size , and right mediastinal . Fullness is likely due to enlargement of the ascending thoracic aorta . There is no pleural effusion , pneumothorax , pulmonary edema , or focal consolidation . No displaced rib fractures are identified .
    OUTPUT:
    
No evidence of pneumonia or displaced rib fracture . Likely enlargement of the ascending thoracic aorta .