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Gamma knife surgery for previously irradiated arteriovenous malformations
B Karlsson1, L Kihlström, C Lindquist
1Department of Neurosurgery, Karolinska Hospital, Stockholm, Sweden.
Neurosurgery
|January 27, 1998
Summary
Second gamma knife treatments for arteriovenous malformations yield similar obliteration rates to initial treatments. However, complication risks increase with prior radiation, and hemorrhages are less common when radiation affects the malformation.
Area of Science:
- Neurosurgery
- Radiation Oncology
- Vascular Neurology
Background:
- Arteriovenous malformations (AVMs) pose significant neurological risks.
- Gamma Knife surgery (GKS) is a treatment option for AVMs.
- Outcomes of repeat GKS for previously treated AVMs require further investigation.
Purpose of the Study:
- To evaluate treatment outcomes after a second GKS for AVMs.
- To compare these outcomes with those following a first GKS.
- To assess the applicability of predictive models for repeat GKS in previously irradiated AVMs.
Main Methods:
- Retrospective analysis of 112 patients undergoing a second GKS.
- Recording of complications, hemorrhage rates, and obliteration rates.
- Comparison of observed outcomes with predicted outcomes based on first-treatment models.
Main Results:
- Obliteration rates after second GKS were comparable to predictions and similar to first GKS.
- Observed complications increased with prior radiation dose.
- Hemorrhage rates were lower post-GKS in the latency period for radiation-affected AVMs.
Conclusions:
- Repeat GKS offers similar obliteration rates to primary GKS for AVMs.
- Cumulative radiation dose correlates with increased complication risk.
- Radiation-induced changes in AVMs may reduce hemorrhage risk post-GKS.