Document Detail

Delayed cyst formation after gamma knife radiosurgery for brain metastases.
MedLine Citation:
PMID:  19834373     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Gamma knife radiosurgery (GKRS) is occasionally a useful tool for maintaining good brain status in patients with brain metastases (METs). Conversely, we recently experienced patients with delayed cyst formation (DCF) several years after GKRS, a complication not previously reported. Herein we assessed the frequency and characteristics of DCF after GKRS for METs. METHODS: Eighty of 1209 patients with METs treated with GKRS maintained good brain status for more than 3 years without regrowth of tumorous lesions in the brain. In this study, DCF was defined as secondary cyst formation more than 3 years after the first GKRS in patients with METs who did not have cysts at the start of MET treatment. The 80 patients were divided into 2 groups (DCF group and non-DCF group) for assessment of the frequency and characteristics of DCF. Of the patients with cystic METs at the start of MET treatment, 16 were included in the latter group. RESULTS: Among these 80 patients, 8 had DCF after GKRS (DCF group), detected by magnetic resonance imaging from 37 to 121 months after the first GKRS (median interval of 53 months). Of these 8 patients, 7 were symptomatic, and surgical treatments including Ommaya reservoir placement were needed in 5. A comparison of the non-DCF and DCF groups revealed that a higher number of GKRS treatments was a risk factor for DCF. Moreover, patients surviving more than 5 years after the initial GKRS are at risk for DCF. CONCLUSION: Although DCF is not a widely recognized complication of GKRS for METs, we advocate careful follow-up, with surgical intervention for DCF if necessary, for frequently irradiated and long-surviving patients with METs treated with GKRS.
Eiichi Ishikawa; Masaaki Yamamoto; Atsushi Saito; Yuji Kujiraoka; Tatsuo Iijima; Hiroyoshi Akutsu; Akira Matsumura
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Neurosurgery     Volume:  65     ISSN:  1524-4040     ISO Abbreviation:  Neurosurgery     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-16     Completed Date:  2010-01-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802914     Medline TA:  Neurosurgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  689-94; discussion 694-5     Citation Subset:  IM    
Department of Neurosurgery, Institute of Clinical Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.
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MeSH Terms
Brain / pathology,  physiopathology,  radiation effects
Brain Neoplasms / secondary*,  surgery*
Carcinoma / secondary*,  surgery*
Central Nervous System Cysts / etiology*,  pathology,  physiopathology
Encephalitis / etiology,  pathology,  physiopathology
Infusion Pumps, Implantable
Magnetic Resonance Imaging
Middle Aged
Ovarian Neoplasms / pathology*
Postoperative Complications / etiology,  pathology,  physiopathology
Radiosurgery / adverse effects*,  methods
Time Factors
Treatment Outcome

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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