Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a right - sided perihilar opacity which is new since ___ and demonstrates interval progression since yesterday 's x-ray . There is also well - defined retrocardiac opacity which is likely due to a hiatal hernia . Elsewhere , lungs are clear . Cardiac silhouette is within normal limits for technique .
    OUTPUT:
    
New / developing right perihilar opacity compatible with infection in the proper clinical setting . Repeat after treatment suggested to document resolution .