[Gamma knife radiosurgery for trigeminal XXXX ].

@entity808 @entity1 @entity1183 @entity41 @entity5 @entity51 @entity892
OBJECTIVE: To evaluate the role of gamma knife (GK) in the treatment of trigeminal @entity808 . METHODS: From June 1994 to June 2000, 38 @entity1 with trigeminal schwannoma treated with GK radiosurgery were reviewed. GK was the primary treatment modality in 30 cases and followed microsurgery in 8 cases. Of the 38 @entity5 , 12 had small cysts within the @entity5 , the rest were solid. The mean diameter of the 38 @entity5 was 32 mm (range: 16 approximately 48 mm) and the @entity5 ranged in volume from 2 to 33 cm(3) (with a mean mean volume of 9 cm(3)). The maximum dose irradiated to @entity5 was 20 to 33 Gy (mean: 26 Gy), the @entity5 margin dose ranged from 11 to 15 Gy (mean: 13 Gy). RESULTS: 35 @entity1 had been followed for 26 to 98 months (mean: 65 months). 20 had been followed more than 60 months. Mild @entity1183 or @entity892 relieved completely in 12 @entity1 after GK treatment. Improvement of @entity51 was seen in 11, unchanged dysfunction or slightly worsening of trigeminal nerve deficits in 9. Three @entity1 had mild worsened symptoms at different time because of @entity5 progression. @entity5 growth control: @entity5 disappeared after GK treatment was observed in 5 cases from 18 to 36 months after, a marked decrease in volume was observed in 24 cases, unchange in 2 cases and increase in 3 cases at 5, 26, and 60 months after respectively. One @entity1 with resolved symptom refused to have MRI examination for more than 6 years. Of the three increased @entity5 , one recurrent @entity5 elapsed 26 months after GK treatment. The second was a small @entity5 and started to progress 5 years after, but after second GK treatment, the @entity5 decreased again. The third was large @entity5 and was subtotally removed through surgery because of @entity5 swelling 5 months after. At last follow-up, the @entity41 remained stable. The control rate of the 35 @entity5 was 91% (32/35). CONCLUSION: Small and middle-size trigeminal @entity808 are the best candidates for GK radiosurgery. The control dose is 13 to 14 Gy.
