Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent small right - sided pleural effusion . Asymmetric right apical opacity is again seen . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . Hypertrophic changes are noted in the spine .
    OUTPUT:
    
Persistent right - sided pleural effusion without superimposed acute cardiopulmonary process . Right apical opacity better characterized by prior PET - CT