Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Comparison is made with the next preceding similar study of ___ . The on previous examination identified moderate amount of pleural effusion on the right base , multifocal thickenings remain . During the latest one - day interval , these changes have not undergone any significant further improvement . As the diaphragms are high positioned indicating poor inspirational effort , the heart size can not be evaluated , but significant interval change can be identified with previous portable multiple chest examinations . There is no evidence of pneumothorax on the present study .
    OUTPUT:
    
Persistent right - sided post-operative pleural densities are stable .