Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there has been no significant interval change . Blunting of the left posterior costophrenic angle is compatible with small effusion . The lungs are clear of consolidation over pulmonary edema . Cardiomediastinal silhouette is stable noting median sternotomy wires and mediastinal clips . Right PICC is no longer visualized .
    OUTPUT:
    
No significant interval change . Persistent small left pleural effusion .