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Research ArticleSpine

Cauda Equina and Filum Terminale Arteriovenous Fistulas: Anatomic and Radiographic Features

K. Namba, Y. Niimi, T. Ishiguro, A. Higaki, N. Toma and M. Komiyama
American Journal of Neuroradiology November 2020, 41 (11) 2166-2170; DOI: https://doi.org/10.3174/ajnr.A6813
K. Namba
aFrom the Center for Endovascular Therapy (K.N., A.H.), Division of Neuroendovascular Surgery, Jichi Medical University, Tochigi, Japan
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Y. Niimi
bDepartment of Neuroendovascular Therapy (Y.N.), St. Luke’s International Hospital, Tokyo, Japan
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T. Ishiguro
cDepartment of Neurointervention (T.I., M.K.), Osaka City General Hospital, Osaka, Japan
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A. Higaki
aFrom the Center for Endovascular Therapy (K.N., A.H.), Division of Neuroendovascular Surgery, Jichi Medical University, Tochigi, Japan
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N. Toma
dDepartment of Neurosurgery (N.T.), Mie University Graduate School of Medicine, Mie, Japan
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M. Komiyama
cDepartment of Neurointervention (T.I., M.K.), Osaka City General Hospital, Osaka, Japan
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Abstract

SUMMARY: Intradural AVF below the conus medullaris may develop either on the filum terminale or the cauda equina (lumbosacral and coccygeal radicular nerves). Although not a few filum terminale AVFs are found in the literature, only 3 detailed cauda equina AVFs have been reported. Here, we analyze the angiographic and MR imaging findings of our cauda equina and filum terminale AVF cases, supplemented with literature research to characterize the radiologic features of the 2 entities. On angiography, filum terminale AVFs were invariably supplied by the extension of the anterior spinal artery accompanied by a closely paralleling filum terminale vein. Cauda equina AVFs were fed by either a radicular or a spinal artery or both arteries, often with a characteristic wavy radicular-perimedullary draining vein. On thin-section axial MR imaging, the filum terminale AVF draining vein joined the spinal cord at the conus medullaris apex, but that of the cauda equina AVF joined above the conus medullaris apex.

ABBREVIATIONS:

ASA
anterior spinal artery
FT
filum terminale
  • © 2020 by American Journal of Neuroradiology
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American Journal of Neuroradiology: 41 (11)
American Journal of Neuroradiology
Vol. 41, Issue 11
1 Nov 2020
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Cauda Equina and Filum Terminale Arteriovenous Fistulas: Anatomic and Radiographic Features
K. Namba, Y. Niimi, T. Ishiguro, A. Higaki, N. Toma, M. Komiyama
American Journal of Neuroradiology Nov 2020, 41 (11) 2166-2170; DOI: 10.3174/ajnr.A6813

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Cauda Equina and Filum Terminale Arteriovenous Fistulas: Anatomic and Radiographic Features
K. Namba, Y. Niimi, T. Ishiguro, A. Higaki, N. Toma, M. Komiyama
American Journal of Neuroradiology Nov 2020, 41 (11) 2166-2170; DOI: 10.3174/ajnr.A6813
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