Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild interstitial pulmonary edema . Nodular opacities at the right lung base appear new from the prior study performed 4 hours earlier , which may represent more focal edema or atelectasis . No sizable pleural effusion or pneumothorax . Mediastinum is not abnormally widened . Heart size is top - normal . Median sternotomy wires are intact .
    OUTPUT:
    
1 . Mild interstitial pulmonary edema . 2 . Right lung base nodular opacities appear to have developed over the past 4 hours , and may represent more focal edema or atelectasis , but superimposed infection should be considered in the appropriate clinical setting .