Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest provided . Lung volumes are low , accentuating the cardiomediastinal silhouette . There is a mild degree of volume overload . There is right base atelectatic change . Right upper mediastinal mass is seen , likely lymphadenopathy . There may be a small left pleural effusion .
    OUTPUT:
    
Large right upper mediastinal lymphadenopathy .