Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single , AP , upright , portable view of the chest was obtained . There are increased interstitial marking . Given history of pulmonary fibrosis on prior CT , although increased interstitial markings have significantly increased since the prior and there may be superimposed pulmonary edema . The cardiac and mediastinal silhouettes are stable . There is slight blunting of both costophrenic angles , felt most likely be due to overlying soft tissues , but a trace pleural effusions be difficult to exclude . No right pleural effusion is seen . There is no pneumothorax .
    OUTPUT:
    
Increased markings bilaterally may be due to the combination of underlying pulmonary fibrosis and moderate pulmonary edema , superimposed infectious process can not be excluded .