Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild left base atelectasis is seen . There may be a trace left pleural effusion . No definite focal consolidation is seen . The mediastinum is similar in appearance with the very markedly tortuous aorta or possible dilatation of the ascending aorta . Cardiac silhouette is stable . Subtle chronic underlying interstitial abnormality . No overt pulmonary edema .
    OUTPUT:
    
Mild left base atelectasis is seen . There may be a trace left pleural effusion . No definite focal consolidation is seen . The mediastinum is similar in appearance with the very markedly tortuous aorta or possible dilatation of the ascending aorta . Cardiac silhouette is stable . Subtle chronic underlying interstitial abnormality . No overt pulmonary edema .