Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval resolution of right apical pneumothorax . New moderate right - sided pleural effusion . Multifocal ground - glass and parenchymal opacities have substantially improved since the prior . Left upper lobe and hilar masses have also improved . Small left pleural effusion . Prior posterior lumbar surgery is unchanged .
    OUTPUT:
    
Substantial improvement of the multifocal opacities and left lung masses . New moderate right - sided effusion .