Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Low lung volumes again noted . Small right - sided pleural effusion persists . Asymmetric density at the left lung apex compared to the right is compatible with post-treatment changes , unchanged . The lungs are otherwise grossly clear . The cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Persistent small right pleural effusion without definite superimposed acute cardiopulmonary process given low lung volumes .