Document Detail

Stereotactic radiosurgery for motor cortex region arteriovenous malformations.
MedLine Citation:
PMID:  11152363     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The optimal management of arteriovenous malformations (AVMs) in critical brain locations remains controversial. To reduce the risk of an AVM hemorrhage and to enhance the possibility of preserving neurological function, stereotactic radiosurgery was performed in 33 patients with newly diagnosed or residual AVMs located within the motor cortex. The role of embolization also was examined. METHODS: During a 9-year study period, 33 patients with AVMs located primarily in the motor cortex region were treated with stereotactic radiosurgery. These patients were followed up radiographically for a minimum of 36 months, or less if obliteration was documented before 36 months had elapsed. Of the 33 patients, 9 underwent embolization and 1 underwent microsurgery before radiosurgery. Nine patients required a second radiosurgery. The mean AVM target volume was 4.35 cc, and the average radiation dose to the AVM margin was 20 Gy. The median follow-up was 36 months (range, 10-91 mo), and angiographic follow-up of eligible patients was performed 24 or 36 months after radiosurgery. RESULTS: Results were stratified by radiosurgical target volumes: less than 3 cc (Group 1), 3 to 10 cc (Group 2), and greater than 10 cc (Group 3). Overall (including second radiosurgery), 13 (87%) of 15 patients in Group 1 had complete obliteration confirmed by angiography. Nine (64%) of 14 patients in Group 2 exhibited nidus obliteration, and one (25%) of four patients in Group 3 demonstrated obliteration on a magnetic resonance imaging scan. Eight patients (24%) underwent second-stage radiosurgery after angiography revealed a persistent AVM nidus; three patients demonstrated complete obliteration on follow-up angiography. The obliteration rate was higher (87%) for AVMs with less than 3 cc target volume and lower (56%) for those with target volumes larger than 3 cc. One patient experienced worsening neurological function after radiosurgery, and one died from delayed AVM hemorrhage during the latency period. No patient bled after angiographically confirmed AVM obliteration. CONCLUSION: Stereotactic radiosurgery is a successful and safe management option for patients with motor cortex AVMs. The obliteration of AVMs and the attendant low morbidity rates indicate a primary role for radiosurgery in these patients. Staged radiosurgery may be necessary to increase obliteration rates for larger AVMs or for those that are not obliterated after the first procedure.
C G Hadjipanayis; E I Levy; A Niranjan; A D Firlik; D Kondziolka; J C Flickinger; L D Lunsford
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neurosurgery     Volume:  48     ISSN:  0148-396X     ISO Abbreviation:  Neurosurgery     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-01-09     Completed Date:  2001-03-08     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7802914     Medline TA:  Neurosurgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  70-6; discussion 76-7     Citation Subset:  IM    
Department of Neurological Surgery, University of Pittsburgh Medical Center, Pennsylvania, USA.
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MeSH Terms
Anticonvulsants / therapeutic use
Cerebral Angiography
Follow-Up Studies
Headache / etiology
Intracranial Arteriovenous Malformations / complications,  diagnosis,  surgery*
Magnetic Resonance Imaging
Middle Aged
Motor Cortex / blood supply*
Radiosurgery* / adverse effects
Seizures / drug therapy,  etiology
Stereotaxic Techniques*
Treatment Outcome
Reg. No./Substance:

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