Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative changes of left - sided lobectomy are again seen with left - sided volume loss . There is persistent left - sided pleural effusion which is likely chronic with associated pleural thickening and left basilar scar . The right lung is clear . The cardiomediastinal silhouette is stable . No acute osseous abnormalities . Drain identified in the left upper quadrant . Degenerative changes are noted in the spine .
    OUTPUT:
    
No acute cardiopulmonary process .