Yong-Sin Hu1,2,3, Cheng-Chia Lee2,4, Chia-An Wu2,3,5, Hsiu-Mei Wu2,3, Huai-Che Yang2,4, Wan-Yuo Guo2,3, Chao-Bao Luo2,3, Kang-Du Liu2,4, Wen-Yuh Chung2,4,6, Chung-Jung Lin7,8. 1. Department of Radiology, Taipei Hospital, Ministry of Health and Welfare, New Taipei, Taiwan. 2. School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan. 3. Department of Radiology, Taipei Veterans General Hospital, No. 201, Shipai Rd., Sec. 2, Beitou District, Taipei, 112, Taiwan. 4. Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan. 5. Department of Radiology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan. 6. Department of Neurosurgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan. 7. School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan. bcjlin@gmail.com. 8. Department of Radiology, Taipei Veterans General Hospital, No. 201, Shipai Rd., Sec. 2, Beitou District, Taipei, 112, Taiwan. bcjlin@gmail.com.
Abstract
PURPOSE: To investigate sinovenous outflow restriction (SOR) in lateral sinus dural arteriovenous fistulas (LSDAVFs) after Gamma Knife radiosurgery (GKRS) and its association with complete obliteration. METHODS: We retrospectively (1995-2019) enrolled 39 patients with LSDAVFs who had undergone GKRS alone and evaluated their angiography and magnetic resonance imaging (MRI) before and after GKRS. The LS conduits ipsilateral and contralateral to the DAVFs were scored using a 5-point scoring system, with scores ranging from 0 (total occlusion) to 4 (fully patent). SOR was defined by a conduit score < 2. Demographics, imaging features, and outcomes were compared between patients with and without ipsilateral SOR after GKRS. Logistic regression analysis was performed to estimate the odds ratio (OR) for obliteration with the imaging findings. RESULTS: After a median angiographic follow-up of 28 months for the 39 patients, the ipsilateral LS became more restrictive (median conduit score before and after GKRS: 2 vs. 1, p = .011). Twenty-one patients with ipsilateral SOR after GKRS had a significantly lower obliteration rate (52.4% vs. 94.4%, p = .005) than those without SOR. Follow-up SOR was independently associated with a lower obliteration rate (OR 0.05, p = .017) after adjustment for age, cortical venous reflux, and absent sinus flow void on MRI. CONCLUSION: This study demonstrates a restrictive change of outflow in LSDAVFs after GKRS and a lower obliteration rate in patients with SOR. Follow-up imaging for SOR may help predict outcomes of these patients.
PURPOSE: To investigate sinovenous outflow restriction (SOR) in lateral sinus dural arteriovenous fistulas (LSDAVFs) after Gamma Knife radiosurgery (GKRS) and its association with complete obliteration. METHODS: We retrospectively (1995-2019) enrolled 39 patients with LSDAVFs who had undergone GKRS alone and evaluated their angiography and magnetic resonance imaging (MRI) before and after GKRS. The LS conduits ipsilateral and contralateral to the DAVFs were scored using a 5-point scoring system, with scores ranging from 0 (total occlusion) to 4 (fully patent). SOR was defined by a conduit score < 2. Demographics, imaging features, and outcomes were compared between patients with and without ipsilateral SOR after GKRS. Logistic regression analysis was performed to estimate the odds ratio (OR) for obliteration with the imaging findings. RESULTS: After a median angiographic follow-up of 28 months for the 39 patients, the ipsilateral LS became more restrictive (median conduit score before and after GKRS: 2 vs. 1, p = .011). Twenty-one patients with ipsilateral SOR after GKRS had a significantly lower obliteration rate (52.4% vs. 94.4%, p = .005) than those without SOR. Follow-up SOR was independently associated with a lower obliteration rate (OR 0.05, p = .017) after adjustment for age, cortical venous reflux, and absent sinus flow void on MRI. CONCLUSION: This study demonstrates a restrictive change of outflow in LSDAVFs after GKRS and a lower obliteration rate in patients with SOR. Follow-up imaging for SOR may help predict outcomes of these patients.
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