Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is mild increase in interstitial markings bilaterally concerning for interstitial edema , atypical infection not excluded . Mild left base atelectasis . No pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Re - demonstrated mild increase in interstitial markings bilaterally may be due to interstitial edema but atypical infection not excluded .