Lumbar epiduroscopic laser neural decompression has a clinical evidence base that would be the envy of most interventional procedures. Jo and Yang's 2013 study in the Korean Journal of Pain documented 87% symptom relief at two weeks in a 77-patient cohort undergoing ELND for failed back surgery syndrome. Liawrungrueang and colleagues, writing in Neurospine in 2025, pushed that figure to 93.3% with what they describe as enhanced epiduroscopic technique — a headline result that has reinvigorated interest in the field. The ongoing RAPID Study (NCT05432219) is building the randomized controlled trial foundation that could establish epiduroscopy-guided decompression as an accepted standard of care.

Against this backdrop, cervical ELND occupies an almost invisible position in the literature. Lumbar ELND is performed at volume. Cervical ELND is performed at the margins of a handful of specialized programs, largely undocumented, rarely discussed at national meetings. The clinical logic for cervical application is identical to the lumbar case — anterior epidural fibrosis following surgery or disc disease, invisible to MRI and CT, compressing exiting nerve roots and contributing to refractory pain in patients who have exhausted other options. But the procedural adoption curve has never materialized.

The reason is not patient selection. It is anatomy, and the instruments that anatomy demands.

The cervical epidural space is not a scaled-down version of the lumbar space

Clinicians who are comfortable with lumbar epiduroscopy sometimes underestimate how different the cervical epidural environment is. The differences are not incremental. They are structural, and they compound the instrument limitation that already constrains lumbar ELND.

In the lumbar spine, the epidural space at L4–S1 has a posterior depth of approximately 4–7 mm at the midline and a canal cross-sectional area generous enough to accommodate a 3–5 mm catheter without placing the dural surface at immediate risk. The thecal sac is spacious. The cauda equina floats within CSF with some tolerance for lateral displacement. Fluoroscopic guidance can place an instrument within workable range of the anterior epidural pathology — not precisely, but close enough that an experienced proceduralist with a side-looking scope can navigate by a combination of fluoroscopy, tactile feedback, and working knowledge of expected anatomy.

In the cervical spine, none of those tolerances apply. The posterior epidural space at C5–C7 — where the majority of clinically significant disc disease and post-surgical fibrosis occur — measures approximately 1.5–3 mm. The spinal cord, unlike the cauda equina, has no fluid cushion and no ability to accommodate lateral displacement. The anterior epidural space, where uncovertebral joint osteophytes, disc material, and postoperative fibrotic bands compress exiting roots and in severe cases the cord itself, is separated from the posterior approach by structures that leave a margin measured in millimeters at best.

The procedural consequence is that current epiduroscopes — devices designed primarily for the lumbar space, with a side-looking lens and an outer diameter that assumes a roomier working environment — cannot safely navigate to the cervical anterior epidural target with the combination of precision and visualization quality the anatomy demands. This is not a training gap. Multiple skilled operators across multiple programs have attempted cervical epiduroscopy with existing instruments and concluded, correctly, that the risk-benefit calculus does not justify routine use.

The limiting factor has never been the clinical indication. It has been the instrument. A side-looking scope in a 2 mm space adjacent to the spinal cord is a navigation problem that no amount of technique refinement can fully solve.

What the SFE architecture is designed to do in this space

The Scanning Fiber Endoscope developed by VerAvanti is built on a single-fiber scanning architecture that addresses the cervical epidural challenge through a combination of form factor, visualization modality, and tissue characterization capability that does not exist in any currently available epiduroscope.

Forward-looking visualization in the cervical canal

The clinical consequence of forward-looking architecture in the cervical epidural space is not marginal — it is categorical. With a side-looking scope, the operator navigating the cervical posterior epidural space toward an anterior target is flying partially blind: the lens shows what is beside the instrument, not what is directly in its path. In a 2 mm corridor adjacent to the spinal cord, that blind spot is not acceptable.

With the SFE, the anterior path is visible before the catheter tip occupies it. Adhesions, fibrotic bands, anatomical narrowing, dural surface proximity — all of these are identified in the approach, not discovered at contact. This transforms the cervical procedure from a navigation exercise with high stakes for navigational error into a guided intervention where the tissue environment informs each millimeter of advancement.

OCT tissue characterization at the cervical target

Optical coherence tomography at 15–25 µm axial resolution provides something no other intraoperative imaging modality offers at this scale: real-time cross-sectional tissue microstructure at the target site. In the cervical anterior epidural space, this means the ability to distinguish epidural fibrosis (dense, irregular backscatter pattern) from disc material (intermediate, organized structure) from normal epidural fat (characteristic low-backscatter adipose signature) from the dural surface (high-specular reflectance).

This matters enormously for therapeutic decisions. Laser energy delivered to epidural fibrosis achieves decompression. Laser energy delivered to disc material requires different parameter selection and technique. Proximity to the dural surface demands immediate halt of advancement. OCT makes all three determinations in real time, without additional imaging, without repositioning, and with a tissue-type resolution that fluoroscopy cannot approximate and intraoperative MRI cannot provide at this scale.

Fluorescence and the inflammatory-versus-fibrotic distinction

A subtlety that the lumbar ELND literature has not fully addressed — because existing instruments cannot address it — is the clinical distinction between actively inflammatory tissue and mature epidural fibrosis. The Ho:YAG laser parameters appropriate for mature scar tissue are different from those appropriate for inflamed, vascularized adhesion.

Treating the wrong tissue type with the wrong parameters risks inadequate decompression, excessive tissue heating, or unnecessary char formation.

SFE fluorescence imaging provides a real-time contrast mechanism that distinguishes vascularized inflammatory tissue from avascular fibrotic scar — without contrast injection, without additional instrumentation, at the point of therapeutic decision. This capability has no equivalent in any currently deployed epiduroscope and represents a meaningful step forward in the precision of laser parameter selection during cervical ELND.

The patient population this approach unlocks

The cervical ELND indication addresses patients with refractory cervical radiculopathy or myelopathy in whom anterior epidural pathology — post-surgical fibrosis following ACDF or laminectomy, residual or recurrent disc herniation, uncovertebral osteophytic encroachment with associated fibrotic response — has not been adequately addressed by current treatment options. These patients exist in substantial numbers at every major spine center. Their options today are revision surgery — which carries significant risk in a previously operated field — spinal cord stimulation, or long-term pharmacological management.

A forward-looking, OCT-guided cervical ELND with direct laser decompression under vision represents a minimally invasive intermediate option that does not currently exist. The clinical case for developing it is compelling. The technical barrier — instrument design — is the one that VerAvanti's SFE platform is built to remove.

Building the evidence base

The Liawrungrueang 2025 result is significant not just for its outcome figure but for what it demonstrates about the technique ceiling. A 93.3% success rate achieved with enhanced epiduroscopic approach — compared to 87% with standard technique — suggests that visualization quality is a direct driver of outcomes. The incremental gain from better technique with existing instruments is approximately 6 percentage points. The incremental gain available from a fundamentally different instrument — one that provides forward-looking visualization, OCT tissue characterization, and fluorescence-guided targeting — is an open research question, and the right one to be asking.

VerAvanti is currently engaging KOLs at cervical spine centers with existing epiduroscopy programs to design the first forward-looking cervical ELND feasibility series. If you perform cervical epiduroscopy, manage patients with cervical FBSS following prior surgery, or lead a program where this indication is relevant, we would welcome the conversation.