Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate right - sided pleural effusion seen on the prior study has resolved . There is also some improvement in the right apical opacity reflecting fluid collection in that region . Cardiomediastinal contours are unchanged . Left lung remains clear . No pneumothorax is appreciated .
    OUTPUT:
    
Interval resolution of right pleural effusion post - thoracentesis .