Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . The previously seen pulmonary edema has resolved since prior exam . Patchy opacities are seen in the lung bases , which likely represent atelectasis , but infection can not be excluded . Scarring is seen in the left lung apex . There is a partially loculated small right pleural effusion , which is slightly improved in interval . There is a trace left pleural effusion , unchanged from prior exam . The cardiomediastinal silhouette is enlarged , unchanged from prior exam . The aorta is noted to be tortuous . There is a right - sided basilar chest tube in unchanged position from prior exam . Median sternotomy wires and CABG clips are noted in the chest .
    OUTPUT:
    
1 . No evidence of pulmonary edema . 2 . Bibasilar opacities , which likely represent atelectasis , but infection can not be excluded .