Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made with the prior chest x-ray of ___ immediately after the left thoracentesis . Since that time , there has been a return of the left pleural effusion , though it is still less than it was prior to aspiration on ___ in the morning . Perfused pulmonary edema is again noted , essentially unchanged since the prior film . Position of the nasogastric tube is unchanged .
    OUTPUT:
    
Left effusion again present , edema unchanged since ___ film .