Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . Retrocardiac opacity is similar in appearance to prior study and may represent atelectasis . There is mild prominence of pulmonary vasculature which may be due to mild pulmonary edema or due to technique . Nodular opacity in the left upper lobe corresponds to calcified nodules seen on recent CT chest .
    OUTPUT:
    
Possible mild pulmonary edema . Otherwise , no acute cardiopulmonary process .