Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Intervally removed the endotracheal and nasogastric tubes . There is persistent large left pleural effusion with residual minimal aeration in the left upper lobe . Underlying pneumonia difficult to exclude . There is mild interstitial pulmonary edema which is new from prior . Cardiomediastinal silhouette can not be assessed . Bony structures are grossly intact .
    OUTPUT:
    
Large left effusion , increased from prior . Difficult to exclude underlying pneumonia . Mild interstitial pulmonary edema .