Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size remains moderately enlarged . Fiducial marker with adjacent opacity within the right middle lobe appears relatively unchanged . Previous pattern of mild pulmonary edema has improved . No new focal consolidation , pleural effusion or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Interval improvement of previously noted mild pulmonary edema . Right middle lobe opacity with fiducial marker , relatively unchanged compared to the previous exam and compatible with known malignancy .