Hi,
Meningiomas are tumors which arise from the meninges.
The overall prognosis of meningiomas is good as they are very rarely malignant. Histology of the tumor is an important deciding factor in the prognosis.
Gamma knife is a radiosurgical device which helps the surgeons to access deep parts of the brain without an open skull surgery. It offers tremendous accuracy with no risk of surgical incision or infection. It has a very good success rate in menigiomas. Do let me know if you need further information.
Take care!
I have a 13mm X 17MM one - whatever you findout - I'd love to know. It's under my brain. Not fun. It sits on the ole factory groove.