Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left - sided pleural effusion , not significantly changed since ___ , though increased since ___ . A right sided port terminates in the upper SVC , stable . The cardiomediastinal silhouette and pulmonary vasculature are stable and unremarkable .
    OUTPUT:
    
Persistent , large left - sided pleural effusion .