Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Prior right - sided central venous catheter is no longer visualized . There is a small left pleural effusion which is grossly unchanged from prior prior right - sided pleural effusion has now resolved . The lungs are clear . The cardiomediastinal silhouette is within normal limits . Median sternotomy wires and mediastinal clips are noted . No acute osseous abnormalities .
    OUTPUT:
    
Persistent small left pleural effusion . Otherwise no acute cardiopulmonary process .