Development and Testing of a Radiosurgery-Based Arteriovenous Malformation Grading System

2012 ◽  
pp. 58-66 ◽  
Author(s):  
Bruce E. Pollock
Keyword(s):  
Arteriovenous Malformation ◽  
Grading System

Validation of the radiosurgery-based arteriovenous malformation score in a large linear accelerator radiosurgery experience

2009 ◽  
Vol 111 (4) ◽  
pp. 832-839 ◽  
Author(s):  
Scott J. Raffa ◽  
Yueh-Yun Chi ◽  
Frank J. Bova ◽  
William A. Friedman
Keyword(s):  
Arteriovenous Malformation ◽  
Patient Outcomes ◽  
Linear Accelerator ◽  
Grading System ◽  
Single Treatment ◽  
Linac Radiosurgery ◽  
Group 4 ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Object The radiosurgery-based arteriovenous malformation (AVM) score (RBAS) is a grading system designed to predict patient outcomes after Gamma Knife surgery for AVMs. This study seeks to validate independently the predictive nature of the RBAS, not only after single treatment but for retreatment, and to assess the overall outcome regardless of number of radiosurgeries. Methods The authors analyzed 403 patients treated with linear accelerator (LINAC) radiosurgery for AVMs between May 1988 and June 2008. The AVM scores were determined by the following equation: AVM score = (0.1 × volume in cm3) + (0.02 × age in years) + (0.3 × location). The location values are as follows: frontal/temporal = 0, parietal/occipital/corpus callosum/cerebellar = 1, and basal ganglia/thalamus/brainstem = 2. Results Testing demonstrated that the RBAS correlated with excellent outcomes after single or repeat radiosurgery (p < 0.001 for both variables). One hundred sixty-two (49%) of 330 patients had excellent outcomes (obliteration without deficit) after a single treatment. Excellent outcomes were achieved in 74, 64, 50, and 11% of patients with AVM scores of < 1.0 (Group 1), between 1.0 and < 1.8 (Group 2), between 1.8 and < 2.5 (Group 3), and ≥ 2.5 (Group 4), respectively. Fifty-one patients (70%) obtained radiosurgical cure and 46 (63%) achieved excellent outcomes after repeat radiosurgery. Of these, 100% achieved excellent outcomes in Group 1, 70% did so in Group 2, 47% in Group 3, and 14% in Group 4. The RBAS correlated with excellent outcomes after overall treatment (p < 0.001). Two hundred seventy-seven patients (69%) obtained AVM obliteration, and 62% achieved excellent outcomes. In Group 1, 87% achieved excellent outcomes, 75% did so in Group 2, 61% in Group 3, and 24% in Group 4. Conclusions The RBAS is a good predictor of patient outcomes after LINAC radiosurgery.

scholarly journals A CEREBRAL ARTERIOVENOUS MALFORMATION GRADING SYSTEM FOR GAMMA KNIFE RADIOSURGERY WITH THE AIM OF EARLY OBLITERATION

1998 ◽  
Vol 48 (Special1) ◽  
pp. 35-40
Author(s):  
Masatoshi Negishi ◽  
Hiroshi K. Inoue ◽  
Masafumi Hirato ◽  
Tohru Shibazaki ◽  
Takao Yokoe ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Cerebral Arteriovenous Malformation ◽  
Grading System

scholarly journals The Application of the Novel Grading Scale (Lawton-Young Grading System) to Predict the Outcome of Brain Arteriovenous Malformation

Neurosurgery ◽  
2018 ◽  
Vol 84 (2) ◽  
pp. 529-536 ◽  
Author(s):  
Ahmad Hafez ◽  
Päivi Koroknay-Pál ◽  
Elias Oulasvirta ◽  
Ahmed Abou Elseoud ◽  
Michael T Lawton ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Grading System ◽  
The Novel ◽  
Brain Arteriovenous Malformation ◽  
Grading Scale

scholarly journals A Grading System for Intracranial Arteriovenous Malformations Applicable to Endovascular Procedures

2000 ◽  
Vol 6 (1_suppl) ◽  
pp. 139-142 ◽  
Author(s):  
B. Sheikh ◽  
I. Nakahara ◽  
A. El-Naggar ◽  
I. Nagata ◽  
H. Kikuchi
Keyword(s):  
Arteriovenous Malformation ◽  
Endovascular Procedures ◽  
Drainage System ◽  
Venous Drainage ◽  
Endovascular Embolization ◽  
Point Of View ◽  
Grading System ◽  
Intracranial Arteriovenous Malformations ◽  
Intracranial Arteriovenous Malformation ◽  
Grading Systems

A grading system was designed by the first author (B.S.) specifically to predict the difficulty of endovascular obliteration of an intracranial arteriovenous malformation based on the feeding arterial characteristics, and the venous drainage system. We have retrospectively reviewed our cases of intracranial arteriovenous malformation, with special interest in those underwent endovascular embolization. The grading of the AVM was by either our new proposed system or by a surgically oriented grading system. Both systems were compared from the endovascular point of view. Using the present proposed grading system intracranial arteriovenous malformation may range from grade I to grade V. The difficulty of the endovascular embolization correlated well with the new grading system, while in most cases it did not reflect the degree of difficulty of the procedure when a pure surgical grading system was used. This newly designed grading system has a better prediction value to the difficulty of performing endovascular embolization than does other grading systems.

The AVICH Score: A Novel Grading System to Predict Clinical Outcome in Arteriovenous Malformation–Related Intracerebral Hemorrhage

2016 ◽  
Vol 92 ◽  
pp. 292-297 ◽  
Author(s):  
Marian C. Neidert ◽  
Michael T. Lawton ◽  
Marius Mader ◽  
Burkhardt Seifert ◽  
Antonios Valavanis ◽  
...  
Keyword(s):  
Clinical Outcome ◽  
Intracerebral Hemorrhage ◽  
Arteriovenous Malformation ◽  
Grading System

MODIFICATION OF THE RADIOSURGERY-BASED ARTERIOVENOUS MALFORMATION GRADING SYSTEM

Neurosurgery ◽  
2008 ◽  
Vol 63 (2) ◽  
pp. 239-243 ◽  
Author(s):  
Bruce E. Pollock ◽  
John C. Flickinger
Keyword(s):  
Arteriovenous Malformation ◽  
Grading System

Testing the radiosurgery-based arteriovenous malformation score and the modified Spetzler—Martin grading system to predict radiosurgical outcome

2005 ◽  
Vol 103 (4) ◽  
pp. 642-648 ◽  
Author(s):  
Yuri M. Andrade-Souza ◽  
Gelareh Zadeh ◽  
Meera Ramani ◽  
Daryl Scora ◽  
May N. Tsao ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Grading System ◽  
Chi Square ◽  
Content Type ◽  
Group 4 ◽  
Chi Square Test ◽  
Group 3 ◽  
Group 2 ◽  
Fine Print ◽  
Group 1

Object. The aim of this study was to validate the radiosurgery-based arteriovenous malformation (AVM) score and the modified Spetzler—Martin grading system to predict radiosurgical outcome. Methods. One hundred thirty-six patients with brain AVMs were randomly selected. These patients had undergone a linear accelerator radiosurgical procedure at a single center between 1989 and 2000. Patients were divided into four groups according to an AVM score, which was calculated from the lesion volume, lesion location, and patient age (Group 1, AVM score < 1; Group 2, AVM score 1–1.49; Group 3, AVM score 1.5–2; and Group 4, AVM score > 2). Patients with a Spetzler—Martin Grade III AVM were divided into Grades IIIA (lesion > 3 cm) and IIIB (lesion < 3 cm). Sixty-two female (45.6%) and 74 male (54.4%) patients with a median age of 37.5 years (mean 37.5 years, range 5–77 years) were followed up for a median of 40 months. The median tumor margin dose was 15 Gy (mean 17.23 Gy, range 15–25 Gy). The proportions of excellent outcomes according to the AVM score were as follows: 91.7% for Group 1, 74.1% for Group 2, 60% for Group 3, and 33.3% for Group 4 (chi-square test, degrees of freedom (df) = 3, p < 0.001). Based on the modified Spetzler—Martin system, Grade I lesions had 88.9% excellent results; Grade II, 69.6%; Grade IIIB, 61.5%; and Grades IIIA and IV, 44.8% (chi-square test, df = 3, p = 0.047). Conclusions. The radiosurgery-based AVM score can be used accurately to predict excellent results following a single radiosurgical treatment for AVM. The modified Spetzler—Martin system can also predict radiosurgical results for AVMs, thus making it possible to use this system while deciding between surgery and radiosurgery.

Abstract #494 Intense Headache in a 51-Year-Old Woman Referred as Complicated Arteriovenous Malformation

2019 ◽  
Vol 25 ◽  
pp. 243-244
Author(s):  
Jose Paz-Ibarra ◽  
Natalia Awramiszyn ◽  
Maria Trujillo
Keyword(s):  
Arteriovenous Malformation
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