The tumor is benign. It developed...Well it was discovered when I was about twelve. I've been under the knife five times, I've had many aensetics (sp) etc. Right now they're stopping my hormone production so more tissue can't grasp the tumor. There's really nothing they can do for it now but they prevent it from growing. I have an IUD so I don't get periods. I don't really understand how it all works but it's due to my period the tumor grew.