Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , the retrocardiac opacity has worsened . This is nonspecific and could be worsening atelectasis , though an infection is difficult to exclude . Right basilar atelectasis appears slightly improved . The apices of the lungs are clear . There is no pulmonary edema . Small bilateral pleural effusions are grossly stable . The mediastinal contours are normal . The heart is moderately enlarged , and unchanged .
    OUTPUT:
    
1 . Worsening left basilar opacity , which could be worsening atelectasis , though pneumonia is difficult to exclude . 2 . Unchanged small bilateral pleural effusions . Results were discussed with Dr . ___ at 4 :20 p .m . on ___ via telephone by Dr . ___ at the time the findings were discovered .