Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is diffuse increase in interstitial markings bilaterally , increased since the prior study , worrisome for moderate to severe pulmonary edema versus atypical infection . No large pleural effusion is seen . There is no evidence of pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Diffuse increase in interstitial markings bilaterally may be due to pulmonary edema versus atypical infection .