chandlers, thanks for asking! No change on the cyst, it measured I think around 9.5 or 10cm and I'm due for another checkup in just under two weeks' time (couple of days before my 12 week scan).
It's a bit frustrating, really - they've given me lots of information, but it's hard to know what (if anything) to do about it. I've spent a lot of time on google. Essentially, because it's so large it's at slightly increased risk of rupturing. Also, it might twist. Both are apparently v painful. If either of those things happen at any time while I'm still pregnant, they'll have to operate in emergency circumstances to remove it. Alternatively, at around 14 weeks they can schedule surgery to remove it, which would be a bit less fraught. When they operate, it has to be under general anaesthetic which is generally advisable to avoid when pregnant because it can result in decreased blood flow to the uterus; also, the operation itself is close to the uterus so there is some (I think small) risk of harm to the baby. If they have to operate in an emergency later on in the pregnancy, the risk is higher because the baby is bigger and the operation to remove the cyst is harder.
It boils down to whether I hold out and hope nothing happens for the whole pregnancy, or take the (hopefully smallish) risk and schedule the surgery for around week 14. It's a really hard decision!
Anyone on the thread had experience of getting a cyst removed during pregnancy, or surviving through pregnancy with a big one?
Chandlers, I reckon as long as they keep monitoring you closely you're OK, and 5-7cm is not so bad, but if I were you I'd ask them to fully explain your options.