Response to the letter to the editor regarding: “Circulatory dynamics of the cauda equina in lumbar canal stenosis using dynamic contrast-enhanced magnetic resonance imaging.” Spine J. 2015;15(10):2132–2141

We thank Dr Jeffrey S. Ross for their interest in our article and would like to respond to their criticisms of our work. We agree about our poor magnetic resonance imaging (MRI) technique and the need to improve it in the future. However, I think the visualization of intraradicular edema by MRI provides very useful help in the diagnosis of lumbar canal stenosis level before surgery. It is generally considered that the genesis of radiculopathy rests not only with mechanical compression but also with circulatory disturbance of the nerve root.

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