Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ at 15 :53 and allowing for considerable differences in positioning . The right cardiophrenic region is better seen , which could reflect either differences in positioning course some improved aeration . The cardiomediastinal silhouette appears less prominent , but this is probably due to differences in positioning . The cardiomediastinal silhouette remains enlarged , with prominent anterior and what is thought to be descending aorta contours . The possibility of pulmonary artery enlargement can not be excluded . There is upper zone redistribution with diffuse blurring and interstitial and some alveolar edema . No gross effusion . Bibasilar patchy opacities .
    OUTPUT:
    
1 . CHF with pulmonary edema . 2 . Bibasilar patchy opacities . Possible slight improvement at the right base , but I suspect this is predominantly due to differences in positioning . 3 . Moderately severe cardiomegaly . The aorta and pulmonary arteries are likely enlarged . The possibility of aneurysmal enlargement is difficult to exclude on this film . If clinically indicated , CT could help to better identify the structures that account for the mediastinal enlargement , including precise ___ of the aorta and pulmonary arteries . ( Review of the abdominal CT from ___ shows that the caliber of the descending aorta below the level of the heart itself is not enlarged . )