Intracranial arteriovenous malformations treated with LINAC-based conformal radiosurgery: validation of the radiosurgery-based arteriovenous malformation score as a predictor of outcome.
OBJECTIVE
To validate the radiosurgery-based arteriovenous malformation score (RBAS) as a predictor of outcome in patients with arteriovenous malformations (AVMs) treated with LINAC-based conformal radiosurgery.


METHODS
We analysed 40 patients with a mean follow-up of 22 months. One patient (2.5%) pertained to Spetzler-Martin Grade I, 11 (27.5%) to Grade II, 19 (47.5%) to Grade III, eight (20%) to Grade IV and one (2.5%) to grade V. The mean RBAS was 2.0 (range: 0.76-5.56). The mean obliteration prediction index (OPI) and the Karlsson index (KI) were 0.74 (range: 0.2-2.86) and 109.48 (range: 3.0-350.7) respectively. Outcomes were analysed according to the OPI, KI and RBAS.


RESULTS
We analysed different cutoff points in the RBAS and found a significant difference to predict the outcome in four scores: 1.2, 1.6, 1.7 and 1.8. In the group with RBAS < or = 1.8, 13 (68%) had an excellent outcome and six (33%) did not, while with RBAS>1.8, seven (32%) had an excellent outcome and 14 (67%) did not (p = 0.02). We did not find any correlation between Spetzler-Martin grading scale or OPI and outcome (p = 0.7 and p = 0.3 respectively). The KI predicted the excellent outcome in 8/9 patients (89%) with KI < or = 27 and in 12/31 patients (39%) with KI>27 (p = 0.08).


CONCLUSIONS
The RBAS seems to be a good predictor of outcome in patients with AVMs treated with LINAC-based conformal radiosurgery as in patients treated with Gamma Knife. It remains only to find the best cutoff point based on a larger series and longer follow-up.
Department of Radiosurgery, Instituto Nacional de Neurología y Neurocirugía MVS, Insurgentes Sur 3877 Col. La Fama, Tlalpan, México City 14269, Mexico.
Sergio
S
Moreno-Jimenez
Miguel Angel
MA
Celis
José Manuel
JM
Larraga-Gutierrez
Jose de Jesus
Jde J
Suarez-Campos
Amanda
A
Garcia-Garduñno
Mariana
M
Hernandez-Bojorquez
Guillermo A
GA
Gutiérrez-Aceves
D000293:Adolescent; D000328:Adult; D002648:Child; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care / Q000379:methods*; D011237:Predictive Value of Tests; D011829:Radiation Dosage; D016634:Radiosurgery / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D016896:Treatment Outcome