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A case of arteriovenous fistula of the cauda equina fed by the proximal radicular artery: anatomical features and treatment precautions

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Abstract

Purpose

Arteriovenous fistula (AVF) of the cauda equina (CE) fed by the proximal radicular artery (PRA) is very rare, and the differentiation from that of the filum terminale (FT) is important to avoid treatment-related injury to the CE when endovascular treatment is selected. The authors describe a case of AVF of the CE fed by the PRA, demonstrate the anatomical features and discuss the treatment precautions.

Methods

A 69-year-old man presented with a transient weakness of lower limbs. Spinal angiography and magnetic resonance (MR) imaging revealed AVF, of which the feeding artery arose from the anterior spinal artery (ASA), forming the fistula at L2 level to be drained into the longitudinal venous trunk. Under a tentative diagnosis of AVF of the FT, endovascular treatment was attempted but failed due to impossible catheterization into the ASA. Therefore, surgery was performed.

Results

Intraoperative finding revealed that the feeding artery and draining vein were not on the FT but on the CE, resulting in the proper diagnosis of AVF of the CE. Surgical clips were applied to the draining vein closest to the fistula, and postoperatively the symptom improved gradually. Although we thoroughly reevaluated spinal angiography and MR images postoperatively, AVF of the CE fed by the PRA and that of the FT were not distinguishable.

Conclusions

The authors described a case of AVF of the CE fed by the PRA and demonstrated the difficulty of the differentiation from that of the FT. The utmost precautions are necessary when endovascular treatment is selected.

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Abbreviations

AVF:

Arteriovenous fistula

ASA:

Anterior spinal artery

CE:

Cauda equina

FT:

Filum terminale

MR:

Magnetic resonance

PRA:

Proximal radicular artery

PSA:

Posterior spinal artery

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Correspondence to Satoru Tanioka.

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The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.

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Tanioka, S., Toma, N., Sakaida, H. et al. A case of arteriovenous fistula of the cauda equina fed by the proximal radicular artery: anatomical features and treatment precautions. Eur Spine J 27 (Suppl 3), 281–286 (2018). https://doi.org/10.1007/s00586-017-5129-0

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  • DOI: https://doi.org/10.1007/s00586-017-5129-0

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