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This study differentiates spinal dural arteriovenous fistulas (AVFs) in the filum terminale and cauda equina. Angiography and MRI reveal distinct feeding arteries and draining vein characteristics for each type.

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Area of Science:

  • Neurology
  • Radiology
  • Vascular Surgery

Background:

  • Intradural arteriovenous fistulas (AVFs) below the conus medullaris are rare, occurring in the filum terminale or cauda equina.
  • While filum terminale AVFs are documented, detailed reports on cauda equina AVFs are limited.

Purpose of the Study:

  • To characterize the distinct angiographic and MR imaging features of filum terminale AVFs and cauda equina AVFs.
  • To improve the diagnostic accuracy and understanding of these rare spinal vascular malformations.

Main Methods:

  • Analysis of angiographic and MR imaging findings from clinical cases of filum terminale and cauda equina AVFs.
  • Comprehensive literature review to supplement case analysis and radiologic characterization.

Main Results:

  • Filum terminale AVFs typically show supply from the anterior spinal artery with a parallel filum terminale vein.
  • Cauda equina AVFs are supplied by radicular or spinal arteries, featuring a wavy radicular-perimedullary draining vein.
  • MRI reveals filum terminale AVF veins joining at the conus medullaris apex, while cauda equina AVF veins join above it.

Conclusions:

  • Distinct imaging patterns on angiography and MRI can differentiate filum terminale AVFs from cauda equina AVFs.
  • Accurate radiologic characterization is crucial for understanding the pathophysiology and guiding treatment of these spinal AVFs.