Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: It is difficult to adequately compare with the the CT scout obtained ___ , however there appears to be an area of increased opacity that could correspond with active infection in the mid right upper lung . The remainder of the lung fields demonstrate unchanged emphysema and diffuse reticular opacities . Right basilar scarring is unchanged . No pleural effusions . No pneumothorax . Heart size is normal . No pulmonary vascular congestion or pulmonary edema .
    OUTPUT:
    
Possible focus of infection in the right upper lung .