Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . A small right pleural effusion is noted not significantly changed from the prior PET - CT allowing for differences in modality . Otherwise , lungs are clear . Cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
Small right pleural effusion , not significantly changed from prior PET - CT .