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What Is Dorsal Root Entry Zone Lesioning?

Dorsal root entry zone lesioning is a destructive neurosurgical pain procedure that creates small lesions where sensory nerve roots enter the spinal cord and connect with superficial dorsal-horn pain pathways. It is commonly abbreviated DREZ lesioning or DREZotomy. The goal is to interrupt abnormal pain signaling generated by injured sensory roots and spinal-cord circuits while preserving as much normal motor and sensory function as possible. Because it intentionally damages neural tissue, it is reserved for severe, medically refractory pain rather than routine chronic pain.

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What Is Dorsal Root Entry Zone Lesioning?

Dorsal root entry zone lesioning is a destructive neurosurgical pain procedure that creates small lesions where sensory nerve roots enter the spinal cord and connect with superficial dorsal-horn pain pathways. It is commonly abbreviated DREZ lesioning or DREZotomy. The goal is to interrupt abnormal pain signaling generated by injured sensory roots and spinal-cord circuits while preserving as much normal motor and sensory function as possible. Because it intentionally damages neural tissue, it is reserved for severe, medically refractory pain rather than routine chronic pain.

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Why Is Dorsal Root Entry Zone Lesioning Performed?

DREZ lesioning is most strongly associated with severe deafferentation pain after brachial plexus avulsion and can also be considered for selected pain after spinal cord injury or cancer treatment. Systematic reviews report more favorable long-term outcomes for brachial plexus avulsion and spinal cord injury than for phantom limb pain or postherpetic neuralgia. Candidates typically have disabling pain that has not responded to medication, rehabilitation, injections, neuromodulation, or other less destructive treatments. The procedure is considered only after the pain pattern, neurologic deficits, imaging, and expected risks of creating additional sensory or motor loss are carefully assessed.

How Is Dorsal Root Entry Zone Lesioning Performed?

The neurosurgeon performs a laminectomy or laminotomy to expose the spinal cord and the affected dorsal root entry zone. Under magnification, the target is identified at the posterolateral spinal cord where injured sensory roots enter the dorsal horn. A fine electrode, microsurgical coagulation tool, or related lesioning instrument is used to create a series of carefully spaced lesions along the painful root levels. Intraoperative neurophysiologic monitoring and mapping can help improve targeting and reduce injury to nearby corticospinal and sensory pathways.

What Is Recovery Like After Dorsal Root Entry Zone Lesioning?

Patients are monitored closely after surgery for pain relief, strength, sensation, coordination, bladder and bowel function, wound healing, and spinal-fluid leakage. Postoperative soreness and temporary neurologic changes can occur while swelling around the treated spinal cord settles. Rehabilitation can be required when weakness, gait changes, sensory loss, or preexisting limb dysfunction affects mobility and daily activity. Pain improvement can be substantial in selected patients, but long-term benefit varies by the underlying pain condition and can diminish over time.

What Are the Risks and Complications?

DREZ lesioning can cause permanent neurologic complications because the target lies within the spinal cord near major sensory and motor pathways. Reported problems include weakness, new sensory loss, gait imbalance, ataxia, painful dysesthesia, bladder or bowel dysfunction, and spinal-cord injury. Other surgical risks include infection, bleeding, cerebrospinal fluid leak, wound problems, and complications related to anesthesia. Systematic reviews report meaningful overall complication rates, so the procedure is generally reserved for severe pain when less destructive options have failed.

Frequently Asked Questions About Dorsal Root Entry Zone Lesioning

What pain condition is most commonly treated with DREZ lesioning?

One of the best-established indications is severe deafferentation pain after brachial plexus root avulsion that remains disabling despite other treatment.

Is DREZ lesioning reversible?

No. The procedure intentionally creates permanent lesions in spinal-cord pain pathways, so neurologic effects cannot simply be turned off or removed.

How successful is DREZ lesioning?

Results depend strongly on the diagnosis. Systematic reviews report the most durable benefit in brachial plexus avulsion and selected spinal cord injury pain.

Can DREZ lesioning cause weakness?

Yes. Nearby motor pathways can be injured, producing temporary or permanent weakness, gait problems, or other neurologic deficits.

References

The Safety and Efficacy of Dorsal Root Entry Zone Lesioning for Pain Management in Patients With Brachial Plexus Avulsion: A Systematic Review and Meta-Analysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/38465954/. Date Accessed September 11, 2026.

Long term results of Dorsal Root Entry Zone (DREZ) lesions for the treatment of intractable pain: A systematic review of the literature on 1242 cases. PubMed. https://pubmed.ncbi.nlm.nih.gov/34739884/. Date Accessed September 11, 2026.

Dorsal Root Entry Zone Lesioning for Brachial Plexus Avulsion: A Comprehensive Literature Review. PubMed. https://pubmed.ncbi.nlm.nih.gov/33469654/. Date Accessed September 11, 2026.

Dorsal root entry zone procedure and other surgeries for pain. PubMed. https://pubmed.ncbi.nlm.nih.gov/35772891/. Date Accessed September 11, 2026.

Dorsal root entry zone lesioning used to treat central neuropathic pain in patients with traumatic spinal cord injury: a systematic review. PubMed. https://pubmed.ncbi.nlm.nih.gov/11923674/. Date Accessed September 11, 2026.