Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval first rib resection . No pneumothorax or pleural if . The lungs are clear . The cardiomediastinal silhouette is unremarkable . The previously described right upper lobe opacity is stable , and likely asymmetric degenerative changes of the costochondral cartilage .
    OUTPUT:
    
No Pneumothorax or pleural effusion post first rib resection .