[Neuropathy in nearby cranial nerves after XXXX gamma knife radiosurgery, a follow-up study].

@entity5513 @entity1 @entity16 @entity5
OBJECTIVE: To investigate the risks of facial, trigeminal and @entity16 after @entity5513 gamma knife radiosurgery. METHODS: The clinical data of forty-three @entity1 with 46 masses of @entity5513 who underwent gamma knife radiosurgery with the dose of 12 approximately 15 Gy to the @entity5 margin between January 1997 and October 2000 and were followed up for 6 approximately 24 months (on average 16.9 months) were studied. The @entity5 diameter was 10 approximately 20 mm in 12 cases, 21 approximately 30 mm in 23 cases, >/= 31 mm in 11 cases, with the average value of 28 mm. RESULTS: The @entity5 control rate was 91.3%. The useful hearing preservation rate was 100% immediately after radiosurgery, 87% 6 months later and 78% 2 years later. The hearing preservation rate was high for small @entity5 . The @entity16 began to appear after 6 months. The incidence rates of @entity16 was 15.3%, 7.6%, and 3.8% 6 months, 1 year and 2 years after radiosurgery respectively. The incidence rates of trigeminal @entity16 was 11.4%, 3.8%, and 3.8% respectively 6 months, 1 year, and 2 years after radiosurgery. The incidence of @entity16 was 3.8% for @entity5 with a diameter < 30 mm for both facial and trigeminal nerves. The hearing in 2 out of 15 cases with dysaudia began to improve 6 months after radiosurgery. The incidence of @entity16 for @entity5 with the diameter > 30 mm was 3.8% for both nerves 2 years after raadiosurgery. The preservation rate of useful hearing for @entity5 with the diameter < 20 mm was 100% after radiosurgery. CONCLUSION: Stereotactic radiosurgery using gamma knife with a dose of 12 approximately 15 Gy to the @entity5 margin succeeds in controlling @entity5513 and preserving useful hearing. The incidence of @entity16 are low. The @entity16 caused by gamma knife radiosurgery is sub-lethal and can be recovered gradually.
