General
- Receive multiple feeders from both the anterior and posterior spinal arteries
- Disruption of the fistula often results in marked improvement of symptoms.
Radiology
Clinical features
- Mechanism
- Increased space in the area of the conus medullaris → veins can grow → form large, dilated venous ectasia → mass effect
- Venous congestion
- Arterial steal on the conus
- Causing
- Myelopathy
- Cauda equine–type syndrome
- Manifest with both upper and lower motor neuron signs.