LINAC-Based Radiosurgery of Arteriovenous Malformation involving Visual Pathway: A Report of Two Cases.
- Author:
Ho Joon KIM
1
;
Young Hwan AHN
;
Seung Hee KANG
;
Yong Sam SHIN
;
Kyung Gi CHO
;
Ki Hong CHO
Author Information
1. Department of Neurosurgery, and Radiation Oncology, Ajou University School of Medicine, Suwon, Korea. yhahn@ajou.ac.kr
- Publication Type:Case Report
- Keywords:
Arteriovenous malformation;
Radiosurgery;
Visual pathway;
Optic chiasm
- MeSH:
Arteriovenous Malformations*;
Follow-Up Studies;
Humans;
Magnetic Resonance Imaging;
Optic Chiasm;
Optic Nerve;
Particle Accelerators;
Radiation Dosage;
Radiosurgery*;
Visual Acuity;
Visual Fields;
Visual Pathways*
- From:Korean Journal of Cerebrovascular Surgery
2004;6(2):172-176
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The authors present two cases of arteriovenous malformation (AVM) involving the visual pathway following linear accelerator (LINAC) stereotactic radiosurgery. Both patients were treated with 18 Gy (marginal dose, 70-80% isodose line, 3 isocenter) delivered to the malformed vascular mass involving the optic tract on the right side. For both patients, however, less than 8 Gy were irradiated onto the ipsilateral optic chiasm and optic nerve, and 4.5 Gy were irradiated onto the contralateral optic nerve (20% isodose line). On the five-year follow-up MRI scan and angiogram, the AVM was totally obliterated in one patient and the AVM was markedly decreased in size in the other patient. Their visual fields were well preserved and visual acuities were even improved for both patients. We report here with on two cases of AVM involving the visual pathway that were effectively and safely treated with 18 Gy using LINAC-based radiosurgery, and we also attempt to define the safe and effective radiation dosage for the patients with AVM involving visual apparatus.
