title: Current gamma knife treatment for ophthalmic branch of primary trigeminal neuralgia.
abstract: OBJECTIVE
  To probe into problems existing in gamma knife treatment of ophthalmic branch of primary trigeminal neuralgia (TN), and propose a safe and effective solution to the problem.
  
  
  METHODS
  Through sorting the literature reporting gamma knife treatment of refractory TN in recent years, this article analyzed the advantages and problems of gamma knife treatment of primary TN, and proposed reasonable assessment for existing problems and the possible solution.
  
  
  RESULTS
  Gamma knife treatment of TN has drawn increasing attention of clinicians due to its unique non-invasion, safety and effectiveness, but there are three related issues to be considered. The first one is the uncertainty of the optimal dose (70-90GY); the second one is the difference in radiotherapy target selection (using a single isocenter or two isocenters); and the third one is the big difference of recurrent pains (specific treatment methods need to be summarized and improved).
  
  
  CONCLUSIONS
  For patients with refractory TN, gamma knife treatment can be selected when the medical treatment fails or drug side effects emerge. The analysis of a large number of TN patients receiving gamma knife treatment has shown that this is a safe and effective treatment method.
authors.affiliation: The Radiotherapy Department of Zhengzhou People's Hospital, Zhengzhou 450052, Henan Province, China.
authors.forename: Guo-Yong
authors.initials: GY
authors.lastname: Shan
authors.forename: Hao-Fang
authors.initials: HF
authors.lastname: Liang
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Zhang