Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the prior chest radiograph from ___ , there has been interval worsening of a retrocardiac opacity . Right basilar patchy opacity is likely related to atelectasis . The heart remains enlarged . There is worsening mild pulmonary edema . The patient is status post CABG with sternal wires and mediastinal clips .
    OUTPUT:
    
1 . Cardiomegaly and worsening mild pulmonary edema . 2 . Increased retrocardiac opacity could represent atelectasis . However , in the proper clinical setting , an infectious process or aspiration can not be excluded .