Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . No definite focal consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable . There is slight increase in interstitial markings bilaterally , which could be due to mild edema versus atypical infection .
    OUTPUT:
    
No focal consolidation . Mild increased interstitial markings bilaterally may relate to mild edema and appear decreased compared to the prior study ; however , atypical infection is not entirely excluded in the appropriate clinical setting .