Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple thin - walled cysts are present within the right middle and right lower lobes , including a dominant posteriorly located cyst which contains a small dependent air - fluid level . As compared to the chest x-ray of ___ , the walls of the cysts appear thinner , and an area of adjacent consolidation within the right lower lobe is no longer apparent . Minimal linear areas of scar or atelectasis are present adjacent to this cyst on the current exam . Remainder of lungs are clear , and cardiomediastinal contours are stable in appearance .
    OUTPUT:
    
Multiple thin - walled cysts , predominantly in the right lower lobe , likely due to post-infectious pneumatocele as suggested on prior CT imaging . Congenital cystic lesions complicated by recent infection are less likely .