STOP!! No surgery!!!
I know from personal experience that you can get rid of the sac without surgery. Sometimes (not often) a chinese doctor knows more than western doctors.
All you need is to massage a couple acupressure points on your elbow. There's a little chinese-medicine explanations, but I just care that this works.
---find and massage this point---
follow the V of your bent elbow (either arm). to the outside (pinky side) of your arm is a depression at the bony part of your elbow. Massage the region between this depression and the V of your elbow. You'll know if you hit the right spot. It should feel sore when you massage it with your fingers.
You can massage this pressure point on either arm and it'll cause this wrist sac to be re-absorbed into your body.
You might also massage where your tendons attach to your bones near your elbow. If it feels sore, rub it. Just don't over kill your arm, okay? Think relaxation massage. A doctor will no doubt tell you that massaging your tennis elbow will worsen the problem _if_ you annoyed your muscles. Do not overkill.
pm me with any questions.
besides, this should work in a week. What's another week if you can avoid the big bucks and scar of a surgery?
Edited to add:
I just read through the thread. OMG, you guys are in pain and will try anything :eye pop:. my herbalist thinks of these wrist cysts as stoppages of chi. My martial-arts coach thinks of them as inflammations due to misuse. Either way, my chinese doctor who trained in martial arts and bone techniques advised me of the accupressure point that relieves the symptom.
my personal experience was thus: My right wrist grew a big peanut-sized bulb on the back of my hand where my index bone met my wrist. this was near the surface. It would feel real _sore_ if I use my wrist for weight, like bench-lifting or punching. It'd get painful after using the computer keyboard.
Then before I decided to schedule for surgery, I went to the chinese doctor who was my *mom*'s doctor. (I didn't want anything to do with superstition and folk remedies. I was so *scientific*. Little did I know how broad my brush was). So I followed the advice. The massage dispersed the sac completely, in under two weeksl. The pain went away in about a couple of days.
I don't care if "chi" is an accurate model of human physiology/anatomy. Or if accupressure points are "only placebo". As a scientist, all I care about is the observable, replicable result. And this stuff is replicable.
my cyst came and went for about a half year. each time a week's worth of massage sent it away. Then after that half year, the cyst never came back.
No surgery. No pain meds. Just that point in the crook of the elbow.
Mind you, this point can cover a lot of cysts on the wrist, even on the elbow (as in tennis elbow). And you don't need to rub near your tennis elbow. You can rub the pressure point on the opposite elbow. But if you have a persistent cyst despite the massage, PM me. I'll consult with the chinese doctor to find you another pressure point. I'm offering this with no strings attached as my homage to medicine buddha who, in stories, toiled to end all suffering. esp. the needless kind.
--replicability--
I just recently (3-months ago) advised another young person who had this cyst. She massaged as I described. Her cyst went away in a week. She was thrilled that she did not have to suffer a scar on her wrist.