Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent , large left pleural effusion , not significantly changed in size since the most recent examination . There is moderate pulmonary edema , slightly improved since the most recent exam , but comparable to the examination dated ___ . Both Lung bases are difficult to evaluate and either old both could ___ pneumonia . The cardiac silhouette is stably enlarged . No pneumothorax is identified . Again noted is a right - sided PICC line , which terminates in the upper SVC . A tracheostomy tube is in standard position .
    OUTPUT:
    
Persistent , large left pleural effusion and moderate pulmonary edema . Pneumonia could be present at both lung bases .