Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and cardiac valve replacement . There has been interval placement of a left - sided central venous catheter terminating in the low SVC . Enlargement of the cardiomediastinal silhouette is stable . There is mild elevation of the right hemidiaphragm . Prominence of the central pulmonary vasculature suggests pulmonary edema . There is also patchy left base retrocardiac opacity into superimposed consolidation due to infection and / or aspiration not excluded . No large pleural effusion is seen but trace right pleural effusion would be difficult to exclude .
    OUTPUT:
    
Elevation of the right hemidiaphragm . Prominence of central pulmonary vasculature suggests pulmonary edema . Left base retrocardiac opacity is seen and superimposed infectious process is not excluded .