I've been recalled LOADS. I have, however, had breast cancer, but since then, I've been called back 10 times.
They'll ultrasound you, because it's a better way to diagnose AND possibly drain the cysts. Ask for a local anaesthetic and you will feel nothing.
IF they find anything suspicious (suspicious doesn't automatically mean cancer remember, I can attest to that), they will do a biopsy. Again, ask for a local anaesthetic injection and you'll feel nothing.
It's terrifying every time I go, BUT, if the worst comes to the worst, I had stage 3 cancer 9 years ago. A very aggressive type. I'm still here.