Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips are again seen . As compared with multiple prior exams , there is persistent though resolving left basal opacity which likely represents a combination of atelectasis , pleural thickening and probable small effusion . In this patient status post recent CABG , findings are likely related to postoperative change . No new opacity is seen . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Persistent but resolving left basal opacity likely representing a combination of atelectasis , pleural thickening and possible small residual effusion .