Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is rotated to the right . There is relative elevation of the left hemidiaphragm , uncertain chronicity without prior . Streaky left basilar opacities suggestive of atelectasis . There is no effusion , pneumothorax or overt pulmonary edema . Cardiac silhouette is difficult to assess given rotation but is grossly unremarkable . There is tortuosity and dense atherosclerotic calcification of the thoracic aorta which appears also moderately enlarged at its proximal descending portion measuring 4 .8 cm . No acute osseous abnormalities
    OUTPUT:
    
Enlarged proximal descending thoracic aorta measuring approximately 4 .8 cm . Elevated left hemidiaphragm , chronicity uncertain without prior . No definite superimposed acute cardiopulmonary process .