I have heard about cysts disappearing. I don't know about the kidneys. Good luck
was the cyst called a Choroid plexus cyst? these are pretty harmless and 99.9 % of the time just go away. both my kids had these on there 19 wekk ultrasounds. MY first son they did a follow up scan around 30 seeks and they had gone. My dayghter she had one on each side and they didnt even bother to do a follow up scan. Dont worry about them they will go. :) as for the kidneys, im not sure sorry.