Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . Previously questioned nodular opacity in the left juxtahilar region and peripheral opacity in left upper lobe are no longer evident . Within the right lower lobe , there has been rapid improvement of opacity medially at the right base , but there has been no substantial change in the presence of a small to moderate right pleural effusion . Small left pleural effusion is also evident .
    OUTPUT:
    
Rapidly improving right lower lobe opacity favors atelectasis or aspiration . Small - to - moderate right and small left pleural effusions .