Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dense retrocardiac opacity persists and is likely in part due to an effusion with possible atelectasis , infection is not excluded . There is moderate pulmonary edema . More conspicuous right basilar opacity is seen on the current exam . Enlarged right hilum and moderate cardiac enlargement is again noted . Median sternotomy wires and mediastinal clips as well as left chest wall dual lead pacing device are unchanged . No acute osseous abnormalities .
    OUTPUT:
    
Findings suggestive of pulmonary edema . Left basilar opacity likely in part due to effusion with atelectasis . Superimposed infection including at the right lung base are possible .