Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are stable since prior examinations and unremarkable . The lungs are largely clear . Post thoracentesis , there is a moderate persistent left sided pleural effusion , larger in size than in ___ . No pneumothorax is present .
    OUTPUT:
    
Persistent , moderate left sided pleural effusion .