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Contrast-enhanced MRI in spinal arteriovenous malformations and fistulae before and after embolisation therapy
K Hasuo1, A Mizushima, F Mihara
1Department of Radiology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Abstract:
MRI was performed in six cases of spinal arteriovenous malformation (AVM) and arteriovenous fistula (AVF) before and after embolisation. Intramedullary and perimedullary AVMs showed marked vascular enhancement after embolisation. This was thought to reflect feeding vessel occlusion and correlated well with a favourable clinical outcome. In dural AVFs, contrast-enhanced studies were essential for the diagnosis, unenhanced images being nonspecific. After embolisation, enhancement of the spinal cord was reduced, although one case with a poor outcome showed persistent enhancement.
Insights
MRI imaging effectively evaluates spinal arteriovenous malformations (AVMs) and fistulas (AVFs) after embolization. Marked enhancement post-treatment in AVMs and reduced enhancement in AVFs correlate with positive clinical outcomes, aiding diagnosis and prognosis.
Area of Science:
- Neuroradiology
- Vascular Neurology
- Interventional Radiology
Background:
- Spinal arteriovenous malformations (AVMs) and arteriovenous fistulas (AVFs) are complex vascular lesions requiring accurate diagnostic and prognostic tools.
- Magnetic Resonance Imaging (MRI) is a key modality for evaluating these conditions, but its role in assessing treatment response needs further clarification.
Purpose of the Study:
- To evaluate the utility of MRI in assessing treatment outcomes for spinal AVMs and AVFs after embolization.
- To correlate MRI findings with clinical outcomes following embolization procedures.
Main Methods:
- Six patients with spinal AVMs or AVFs underwent MRI before and after embolization.
- Contrast-enhanced MRI sequences were utilized to assess vascular enhancement patterns.
- Clinical outcomes were assessed post-embolization and correlated with imaging findings.
Main Results:
- Intramedullary and perimedullary AVMs demonstrated significant vascular enhancement post-embolization, linked to favorable clinical results.
- Contrast-enhanced MRI was crucial for diagnosing dural AVFs, as unenhanced images were non-specific.
- Following embolization, spinal cord enhancement decreased in dural AVFs, with persistent enhancement noted in a case with a poor outcome.
Conclusions:
- Post-embolization MRI findings, particularly vascular enhancement patterns, are valuable indicators of treatment success in spinal AVMs and AVFs.
- Contrast-enhanced MRI is essential for the diagnosis of dural AVFs and for monitoring treatment response.
- MRI findings correlate with clinical outcomes, aiding in the prediction of patient prognosis after embolization.