맥락막종양에 대한 감마나이프 방사선수술의 단기 치료 효과
Short-term Effect of Gamma Knife Radiosurgery for a Choroidal Tumor
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목적: 맥락막종양 환자에서 감마나이프 방사선수술의 효과와 안전성에 대해서 알아보고자 하였다. 대상과 방법: 2016년 1월부터 2019년 2월까지 맥락막종양을 진단받고 감마나이프 방사선수술을 받은 환자들 중 1개월 이상 추적 관찰이 가능하였던 8명, 10안을 대상으로 의무기록을 후향적으로 분석하였다. 결과: 대상 환자의 평균 연령은 57.9 ± 14.6세(32-83세)였으며, 맥락막 전이암이 6안, 맥락막흑색종이 4안이었다. 감마나이프 방사선수술 후 평균 추적 관찰 기간은 7.0 ± 4.3개월(2-13개월)이었고, 평균 누적 주변부 선량은 25.36 ± 7.35 Gy (16-45 Gy)이었다. 치료 전후의 자기공명영상검사상 10안 중 8안에서 종양의 크기가 감소하였으며, 이 중 5안에서 주관적인 증상의 호전이 관찰되었다. 1명의 환자에서 종양의 크기가 증가하였으나 새로운 병변이 관찰되지 않았다. 다른 1명의 환자는 종양의 크기에 변화를 보이지 않았으나 통증이 악화되어 안구적출술을 시행하였다. 종양의 평균 크기는 감마나이프 방사선수술 전 평균 최대직경 1.60 ± 0.37 cm에서 치료 후 1.22 ± 0.47 cm (p=0.004)로, 평균 최소직경 0.62 ± 0.27 cm에서 0.38 ± 0.35 cm로 감소하였다(p=0.031). 대상 환자의 추적 관찰 기간 동안 방사선 관련 망막병증, 시신경병증, 백내장 등의 합병증은 관찰되지 않았다. 결론: 감마나이프 방사선수술은 안와 자기공명영상에서 맥락막종양 확인이 가능한 병변인 경우에 종양의 크기 감소를 기대할 수 있고, 안구 보존을 기대할 수 있는 비교적 안전한 대체 치료 방법의 하나로 판단된다.
Abstract
Purpose: To evaluate the effectiveness and safety of treating choroidal melanoma and cancer that has metastasized to the choroid with gamma knife radiosurgery (GKR). Methods: We performed a retrospective chart review that included 10 eyes of eight patients with a diagnosis of choroidal tumors who underwent GKR between January 2016 and February 2019 and who had at least one month follow-up visit. Results: The mean patient age was 57.9 ± 14.6 years (range, 32-83 years). The choroidal tumor group included six choroidal metastases and four choroidal melanomas. The mean follow-up period after GKR was 7.0 ± 4.3 months (range, 2-13 months). The mean cumulative marginal dose was 25.36 ± 7.35 Gy (range, 16-45 Gy). Pre- and postoperative magnetic resonance imaging revealed a reduction in tumor volume in eight of the 10 eyes and five of them presented with improved visual symptoms. One patient showed increased tumor volume; however, a new choroidal lesion was not observed. Another patient showed no reduction in tumor size; however, the pain had worsened, and the eye was enucleated. The mean maximum tumor diameter decreased from 1.60 ± 0.37 cm before to 1.22 ± 0.47 cm after GKR (p = 0.004), and the mean minimum diameter decreased from 0.62 ± 0.27 cm before to 0.38 ± 0.35 cm after GKR (p = 0.031). No radiation-induced optic neuropathy, retinopathy, or cataracts was observed in any of the cases during the follow-up period. Conclusions: GKR was shown to be safe for choroidal lesions identified in orbital magnetic resonance imaging with a reduction in the size of choroidal tumors and eyeball preservation expected with this treatment approach.
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