Hello Karen (@immmm) - Welcome to Mayo Connect, thank you for being an advocate for your best friend and helping her find information. Hopefully another Connect member will join the discussion and be able to offer more information. Until they do I did a quick search on Google Scholar (https://scholar.google.com/) and found something I think may explain it a little better. I searched for the phrase "cystic lesion of the liver" and it came up with a few good links that may help. Here is the list of links:

Is your friend able to contact the doctor when she gets home? I think they would be able to offer the best explanation and at the same time answer any follow up questions she may have.

John