Radiosurgery for XXXX : results of low-dose treatment.

@entity1 @entity5513 @entity5 @entity16 @entity2473 @entity3541
OBJECTIVE: The results of radiosurgical treatment of @entity5513 have improved by reducing the @entity5 marginal doses. We report relatively long-term follow-up results (>5 yr) for @entity1 who underwent low-dose radiosurgery. METHODS: We treated and followed 51 consecutive @entity1 with unilateral @entity5513 who were treated from January 1994 to December 1996 by gamma knife radiosurgery at low doses (</=12 Gy to the @entity5 margin). The average age of the @entity1 was 55 years (range, 32-76 yr). The treatment volume was 0.7 to 24.9 cm(3) (median, 3.6 cm(3)). The marginal radiation dose was 8 to 12 Gy (median, 12 Gy), and the follow-up period ranged from 18 to 96 months (median, 60 mo). RESULTS: Clinical @entity5 growth control (without @entity5 resection) was achieved in 96% of @entity1 , and the 5-year @entity5 growth control rate was 92%. Hearing was preserved in 59% of those with preradiosurgical hearing preservation (Gardner-Robertson Classes 1-4), and improvements (>20 dB of improvement) were noted in 9% of the @entity1 with any hearing. Hearing was preserved at a useful level (Gardner-Robertson Classes 1 and 2) in 56% of @entity1 . Although preexisting @entity16 worsened in 4% of the @entity1 , our @entity1 did not experience new @entity3541 or @entity16 after radiosurgery. Facial @entity2473 occurred in 6% of the @entity1 , and intratumoral bleeding occurred in 4% of @entity1 . CONCLUSION: Low-dose radiosurgery (</=12 Gy at the @entity5 margin) can achieve a high @entity5 growth control rate and maintain low postradiosurgical morbidity (including hearing preservation) for @entity5513 .
