Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Because today 's exam is erect PA and lateral the exact comparison of the pneumothorax is hard to assess . It has not changed significantly and is still small at apex measuring 9 mm . There is now air - fluid level seen inferiorly . Prior sternotomy was done for CABG in this patient with moderate cardiomegaly , left lung is unremarkable .
    OUTPUT:
    
No significant change in small right hydropneumothorax considering the difference in positioning of the patient .