Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval improvement and but persistence of the left sided pleural effusion . Tiny right - sided pleural effusion , if present . No focal consolidation or frank pulmonary edema . No pneumothorax . Stable enlarged heart . Stable mildly tortuous descending aorta . Median sternotomy wires appear intact and unchanged in position . The two - lead cardiac device is unchanged with one lead ending in the right atrium and the other lead ending in the right ventricle .
    OUTPUT:
    
Persistent but improved moderate left pleural effusion since ___ .