Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right - sided pleural effusion has improved slightly since the prior study . The cardiac , mediastinal and hilar contours remain stable and unremarkable . Again noted are perihilar and perifissural opacities which remain stable as well as the left apical opacity .
    OUTPUT:
    
Slight improvement of right - sided pleural effusion .