Complications Of Gamma Knife Radiosurgery For Avm

Keywords: arteriovenous malformation, complications, gamma knife, hemorrhage, cyst

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     Clinical analysis of complications after gamma knife radiosurgery for AVM was investigated.
     523 AVM patients who underwent GKR between 1992 and 2007 in Tokyo Women`s Medical University Hospital were evaluated. Twelve patients developed cyst formation after GKR of AVM. Ten patients bled after GKR.
     Treatment protocol was as followed. The peripheral dose was delivered 12-26 Gy at the margin by using multi-isocenter technique. Patients were followed up by CT, MRI and DSA.
     Twelve cases of cyst formation were clinically analyzed.
     This is a retrospective study.
     Symptomatic cyst formation after GKR for AVM may require surgical treatment. There is possibility of residual AVM nidus despite of confirmation angiographical obliteration.
     The dose planning is the most important factor depends on ergy. Long term follow up is recommended after nidus obliteration confirmed by angiography. Staged GKR was useful for selective cases.


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