As a result, herniation accompanied by spinal canal or nerve root canal stenosis (b-ii, iii, iv) is often treated after misdiagnosis as simple herniation.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4017306/
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For patients with lumbar spine MRI showing foraminal stenosis, decompression of the nerve root canal is also needed.
https://www.frontiersin.org/articles/10.3389/fsurg.2021.6289...

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Nerve Root Canal
The nerve root canal is located at the lateral aspect of the spinal canal (Fig. 28-1). The dural sac forms the medial wall of the canal, the internal aspect of the pedicle, and the lateral wall. The posterior border of the nerve root canal is formed by the ligamentum flavum, superior articular process, and lamina. The anterior border of the canal is formed by the vertebral body and IVD.

The nerve root canal can be described according to its location35:

img The entrance zone is medial and anterior to the superior articular process.

img The middle zone is located under the pars interarticularis of the lamina and below the pedicle.

img The exit zone is the area surrounding the intervertebral foramen.

A decrease in the dimension of this canal results in a condition called lateral stenotic syndrome.36

https://musculoskeletalkey.com/lumbar-spine-5/

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Note added at 1 hr (2022-11-22 15:23:56 GMT)
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