Yes, I can relate! Haven't met many others with this, but I understand it's not deserately unusual.
I had a football-sized ovarian dermoid cyst 13 years ago now, discovered simply because I had to pee more than normal (I noticed it on a ski trip...not easy to pee all the time then!
), so had a scan done. Ultrasound lady had absolutely no bedside manner. I had just turned 19, had never had sex and she did a vaginal ultrasound without any prior info given to me or consent or anything (I had subsequent vag ultrasounds in years after and doctors always gave me the choice and asked me if I was a virgin before any test done). Also, when she was doing the regular ultrasound and going "Hmm..." a lot, I asked her what she could see. She said "I cannot find your left ovary. It has been taken over. But don't worry, you still have another one". No joke. She was horrid.
I was referred to a gynaecological oncologist urgently. It was surgically removed a few days after they found it. The GP I saw didn't know what it was for a day or so, and thought it might have been an agressive cancer, since she had never seen one before.
After the specialist looked for about 10 seconds at the X-ray they did and saw it had bone and teeth growing in it (!!!), he said right away he knew it was a dermoid. After finding out it wasn't actually that serious and definitely nothing like cancer (of course, abdominal surgery is still a big deal), I was very relieved, so went along with the plan to remove it without hesitation.
Surgery all smooth, recovery pretty good. My unplanned C-section 10 years later was an even easier recovery though, which I put down to the fact that the dermoid removal was under general then, and C-sec was an epidural/spinal and I got up and around a lot sooner with the C-sec. I didn't even think twice about the dermoid surgery, since I was just so happy it wasn't something like cancer and I had the surgery so soon after they diagnosed it.
My left ovary is now about 2/3 to 1/2 the size of my right one. The docs said it would still work. I've had 2 pregnancies, with no problems conceiving (but I know the last came from my right ovary). I had annual scans for a few years after the surgery, but that was really for my own peace of mind, since they very rarely re-grow.
I guess my biggest fear now from my experience then is that how can something grow so big and you don't even notice it?! It has made me a little bit of a hypercondriac, in the sense that now if I have any new symptoms of a potential problem I rush off the the doctor to have every test done, just to be safe. It's not as bad now, but for the first few years after finding it, I was a bit anxious about my health.
How are you feeling about the cyst and having surgery? It sounds like the docs haven't given you too much info. I would imagine it's in your ovary, not uterus. Never heard of uterine dermoid cysts. They are relatively common in the ovary, so far as dermoid cysts go. Very interesting growths actually. Did they tell you anything about them? I saw a picture of one cut open. Looked like a bird's nest. Full of hair and skin and bone and teeth and even lung!!! Kinda cool actually.
I hope you are not too worried, but I could understand if you are anxious. If I can give you anymore info, don't hesitate to ask. Hang in there....it will be gone soon!