Liver cysts cancerous?

Cysts do not normally represent cancer. They are only fluid filled sacs. Yes, they will cause pain because like everything else that doesn't belong in these spaces, they grow, put pressure on the organ or whatever area they're in and cause pain. On the whole, if these are only cysts, they are not cancerous. Breast cancer can certainly show up somewhere else down the line, but that usually happens if not caught in time or it began to metastasize, (spread) before the Oncologist knew it. Don't worry, until all tests are in there doesn't seem to be any worry and by the way, all doctors have that "look" on their faces when they don't know for sure what it is. That's why more tests are being ordered. Hope your mom does well. God bless