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Radiosurgery for Cystic Metastatic Brain Tumor Masafumi UCHINO 1 , Takeki NAGAO 1 , Yoshikatsu SEIKI 1 , Iekado SHIBATA 1 , Hideo TERAO 2 , Itsuo KANEKO 3 1Department of Neurosurgery, Toho University School of Medicine 2Department of Neurosurgery, Nishi-Yokohama Kokusai Hospital 3Department of Radiology, Toho University School of Medicine Keyword: metastatic brain tumor , cyst , linac radiosurgery , stereotactic aspiration , lung cancer pp.417-421
Published Date 2000/5/10
DOI https://doi.org/10.11477/mf.1436901886
  • Abstract
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Stereotactic radiosurgery (SRS) for brain metastasis results in a high local control rate. But cystic metastatic tumor should have been a contraindication for SRS. Because it is often found that a cyst is too large to be irradiated, the tumor does not exist in the center of the irradiation field. Between 1995 and 1998, 8 consecutive patients underwent linear accelerator-based SRS for cystic brain metastases identified by computed tomography or magnetic resonance image scan. Stereotactic cyst aspiration is carried out af-ter placement of the BRW frame under local anesthesia. All of the patients except one were confirmed to have sufficient reduction of the cysts. 5-7 days after stereotactic cyst aspiration, SRS was performed. The dose range was 25-30 Gy. In follow-up MRI, local recurrences and enlargement of cysts were not noted. Six patients with neurological symptoms recuperated satisfactorily. Median survival was 30 weeks from the date of radiosurgery. All of the patients died and the causes of death were related with the primary lesion. We conclude that our technique, a combination of stereotactic cyst aspiration and SRS is an effective measure which leads to palliation of neurologic symptoms and is a low risk treatment for patients with cystic brain metastasis.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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