Can Multiple Sclerosis Be Mistaken for Spinal Stenosis?

Multiple sclerosis and spinal stenosis can absolutely be mistaken for each other, and the confusion runs in both directions. Both conditions can cause limb weakness, numbness, difficulty walking, and problems with coordination, particularly when the cervical (neck) spine is involved. A literature review published in 2024 noted that MS, degenerative cervical myelopathy, and other neurological conditions share motor symptoms that make diagnosis difficult, especially early in the disease course.¹ The diagnostic overlap is significant enough that some patients have been treated for the wrong condition for years before being re-evaluated.

Why the Two Conditions Look So Similar

The core reason for the confusion is anatomical. MS attacks the myelin sheath covering nerve fibers in the brain and spinal cord, while spinal stenosis physically compresses the spinal cord or nerve roots by narrowing the spinal canal. When either process damages the same stretch of spinal cord, the downstream symptoms are nearly identical: stiff legs, clumsy hands, tingling or numbness in the arms and feet, and an unsteady gait. Both can also cause bladder problems. A patient walking into a clinic with progressive weakness in both legs, some numbness, and trouble with balance could plausibly have either condition, or both.

The overlap is particularly deceptive when stenosis occurs in the cervical spine. Cervical spondylotic myelopathy, the clinical syndrome that results from compression of the spinal cord by degenerative changes in the neck, produces a pattern of upper and lower extremity dysfunction that closely mirrors the myelopathy seen in MS. Neck and shoulder pain tend to be more prominent in degenerative cervical myelopathy, while visual disturbances point more toward MS, but many patients do not present with those distinguishing features.¹

When One Condition Masquerades as the Other

Published case reports illustrate how convincingly spinal stenosis can mimic MS. In one documented case, a 44-year-old man presented with chronic progressive myelopathy. Imaging showed cervical spondylosis alongside an enhancing lesion inside the spinal cord, and he was diagnosed with MS. A 56-year-old man had a nearly identical presentation and was diagnosed with an unspecified autoimmune demyelinating disorder. Both were treated with immune therapies for what clinicians believed was inflammatory disease. Neither improved. Instead, both continued to decline, and it was only after re-evaluation that the picture became clearer: cervical spondylotic myelopathy was mimicking the appearance of an inflammatory spinal cord condition.²

The misdiagnosis went beyond clinical symptoms. In both patients, imaging revealed what looked like an enhancing intramedullary lesion, the type of finding that radiologists and neurologists associate with demyelinating disease. When the immune therapies failed and functional decline continued, clinicians had to reconsider whether the lesion truly represented inflammation or was instead a byproduct of chronic compression. This scenario is a cautionary example: even MRI findings that seem to point toward MS can sometimes be produced by a structural process like stenosis.

The reverse also happens. Someone with early MS can develop leg weakness and numbness that gets attributed to a narrowed spinal canal found on imaging, particularly in middle-aged or older adults where some degree of degenerative stenosis is nearly universal. An incidental finding of mild stenosis on MRI can divert attention away from the real culprit. The patient may undergo spinal surgery that provides no relief, because the symptoms were driven by MS lesions, not mechanical compression.

How Doctors Separate the Two

The diagnostic workup hinges on a combination of brain imaging, spinal cord imaging, cerebrospinal fluid analysis, and the overall clinical story. No single test is definitive on its own, but the combination usually points in the right direction.

Brain MRI is one of the most valuable tools for distinguishing the two conditions. MS typically produces scattered white matter lesions in characteristic brain locations, particularly around the ventricles, in the brainstem, and near the cortex. Spinal stenosis, by contrast, is a mechanical problem that does not cause brain lesions. In a study of patients with structural spinal cord lesions (including spinal vascular malformations), brain MRI was performed and did not reveal any white matter lesions compatible with MS.³ A clean brain MRI does not completely rule out MS, since a small percentage of MS patients have spinal-cord-only disease, but it sharply lowers the probability.

Cerebrospinal fluid testing, specifically looking for oligoclonal bands, adds another layer. These bands are found in the majority of people with MS and reflect immune activity within the central nervous system. They are less commonly found in pure structural conditions. However, the picture is not perfectly clean: some structural spinal cord lesions have been reported alongside oligoclonal bands, so the test is helpful but not foolproof.³

On spinal MRI, the character of the lesion matters. MS lesions in the spinal cord tend to be relatively short (spanning fewer than two vertebral segments), sit eccentrically within the cord’s cross-section, and sometimes enhance with contrast during active inflammation. Degenerative cervical myelopathy tends to produce a signal change at the level of maximum compression, often spanning the compressed segment and appearing as a more diffuse, central brightness on T2-weighted images. Advanced diffusion MRI techniques are increasingly useful here. Diffusion tensor imaging can detect microstructural changes in white matter that are invisible on standard MRI, helping to distinguish demyelination from compression-related damage.⁴

Symptoms That Help Tell Them Apart

While the overlap is real, some clinical features lean more heavily toward one condition. Neck pain and arm pain radiating along a specific nerve root distribution are much more common in cervical stenosis than in MS. If you have shooting pain from the neck down into the shoulder and arm that follows a clear dermatomal path, that points toward a compressed nerve root. MS can cause pain, but it tends to be less localized and more often involves burning or electric sensations.

Visual symptoms strongly favor MS. Optic neuritis, which causes painful vision loss usually in one eye, is a hallmark of MS and does not occur in spinal stenosis. Similarly, Lhermitte’s sign, an electric-shock sensation running down the spine when you flex the neck, is classically associated with MS, though it can occasionally occur with cervical stenosis as well. The clinical pattern of relapses and remissions, where symptoms flare for weeks and then partially or fully recover, is characteristic of relapsing-remitting MS and would be unusual for spinal stenosis, which tends to progress more steadily.

Central neuropathic pain, a burning or squeezing sensation not tied to a specific injury, is a well-recognized feature of MS. Research has linked this type of pain to demyelinating lesions located centrally within the upper and mid-thoracic spinal cord, between the T1 and T6 vertebral levels, with a strong statistical association.⁵ Thoracic stenosis, while it does exist, is uncommon compared to cervical and lumbar stenosis. So central neuropathic pain in the torso, without evidence of thoracic disc herniation or stenosis, is a clinical clue that points toward MS.

Lumbar spinal stenosis, the other common form, produces its own distinctive symptom: neurogenic claudication. This is leg heaviness, pain, or weakness that comes on with walking or standing and improves when you sit down or lean forward. While people with MS also experience fatigue and difficulty walking that worsens with exertion and heat, the positional nature of neurogenic claudication is different. Sitting or bending forward relieves the compression in lumbar stenosis by opening the spinal canal slightly; MS-related walking difficulty does not respond to posture changes in the same way.

When Both Conditions Exist Together

The two conditions are not mutually exclusive, and this is where the diagnostic picture becomes genuinely complicated. Degenerative spinal stenosis is extremely common in middle-aged and older adults, and MS is a lifelong disease. As people with MS age, many develop the same degenerative spinal changes everyone else does. A study of 48 patients with both MS and cervical stenosis followed for an average of about four and a half years found that differentiating between the two was difficult precisely because of their overlapping symptoms.⁶

Intriguingly, there may be a biological link between the two. A retrospective study found that in patients who had both MS and cervical stenosis, spinal segments with significant stenosis were more than twice as likely to also harbor an MS lesion in the same segment compared to segments without stenosis.⁷ The researchers speculated that mechanical compression might disrupt the blood-spinal cord barrier, making those segments more vulnerable to immune-mediated attack. If that hypothesis holds, stenosis and MS may not simply coexist by coincidence in some patients but may actually feed into each other.

This overlap creates a real clinical dilemma. When someone with known MS develops worsening arm weakness and hand clumsiness, is it an MS relapse, progression of existing MS, or compression from a stenotic cervical spine? The answer determines whether the patient needs a change in MS medication, a course of steroids, or a referral to a spine surgeon. Getting it wrong can mean unnecessary surgery or, conversely, a missed opportunity to decompress a compressed spinal cord.

What Happens When Patients With Both Conditions Have Surgery

Because the two conditions so commonly coexist, a fair amount of research has explored what happens when patients with both MS and cervical stenosis undergo spinal decompression surgery. The short answer: surgery helps, but not as much as it helps patients who have stenosis alone.

A review of the literature found that the majority of patients with both conditions experienced either improvement or stabilization of their symptoms after surgery. No MS relapses, permanent neurological worsening, or serious complications from the surgery itself were noted across the reviewed cases. In one series, 13 of 15 patients showed objective improvement in neurological function, including increased arm and leg strength, and most also had improvement in neck pain or arm tingling. Two patients had persistent tingling that did not resolve.⁸

However, the gap between MS patients and non-MS patients is real. In a direct comparison, about 39% of patients in the MS group did not improve in the short term after surgery, compared to 23% of those without MS. Over the longer term, the gap widened: 44% of MS patients showed no improvement versus 19% of controls.⁹ The explanation is straightforward: surgery can relieve mechanical compression, but it cannot repair the underlying demyelination caused by MS. Symptoms driven by stenosis may resolve, while symptoms driven by MS persist or progress.

One older study reported that five of seven patients with coexisting MS and spondylosis demonstrated significant improvement after surgery, though one experienced a transient MS exacerbation afterward.¹⁰ Bladder problems appear to be one symptom category that is unlikely to improve after spinal surgery in patients with both conditions, probably because bladder dysfunction in MS is often driven by lesions in the brain and spinal cord rather than by nerve root compression.⁸

The practical takeaway for patients in this situation: surgery is still worth considering when there is clear evidence of cord compression on imaging and the symptoms match a compressive pattern. But expectations need to be calibrated. Neck pain and arm symptoms tend to respond best; myelopathic symptoms like leg stiffness and walking difficulty improve less reliably; and bladder function often does not change.

MRI Findings That Can Mislead

One of the trickiest aspects of this diagnostic confusion is that MRI findings themselves can be ambiguous. A high-intensity signal within the spinal cord on T2-weighted MRI can represent either an MS plaque or swelling from chronic compression. Both appear bright on the same sequences. Radiologists use context to interpret these findings: if the bright signal sits right at the level of a narrowed disc space and the patient is 60 years old with no brain lesions, compression is the likely explanation. If the bright signal is eccentric, short, and the patient has other lesions in the brain, MS is more probable. But in borderline cases, the distinction is not clear-cut.

For patients who have both conditions, the presence of high-intensity spinal cord lesions on preoperative MRI may actually predict a better surgical outcome. Among 48 patients with concurrent MS and cervical stenosis, a significantly greater percentage of patients who improved after surgery had high-intensity lesions on preoperative MRI compared to those who did not improve.⁶ This may seem counterintuitive, but the logic is that a visible cord signal at the compression site suggests that compression is doing real damage there, meaning surgery to relieve that compression has a target to address. Patients without visible cord signal changes may have symptoms driven more by their MS than by the stenosis, making surgery less likely to help.

Who Is Most at Risk for Misdiagnosis

Certain patient profiles make the diagnostic confusion more likely. Middle-aged adults are the prime risk group, because both conditions commonly present in the 40s and 50s. Someone in their late 40s who develops slowly progressive leg stiffness and hand clumsiness sits right in the demographic overlap zone. If they happen to have some degenerative disc disease on MRI, which many people that age do whether or not it is causing symptoms, the imaging may draw clinical attention toward the spine and away from the possibility of MS.

Men may be slightly more vulnerable to this particular misdiagnosis path. Cervical spondylotic myelopathy is more common in men, and primary progressive MS, the form of MS that causes gradual decline without clear relapses, also has a more equal sex ratio compared to the female-predominant relapsing-remitting form. A man in his 50s with slowly worsening legs and no history of discrete attacks could easily be sent down a spine surgery pathway before anyone considers MS.

People who already carry one diagnosis are also at risk. If you have been diagnosed with MS, new or worsening symptoms may be reflexively attributed to your MS when cervical stenosis could be contributing. If you have been told you have spinal stenosis, a new bout of numbness or weakness may be blamed on your spine when it could be a first attack of MS. Either way, the existing label creates a cognitive bias that makes it harder to recognize a second process.

Gadolinium Enhancement and the Timing Question

One imaging detail that can help, but sometimes adds confusion, is gadolinium contrast enhancement. In MS, a lesion that enhances with gadolinium on MRI signals active inflammation, typically corresponding to a recent or ongoing attack. Enhancement usually fades within a few weeks to months. Chronic MS lesions do not enhance. Cervical spondylotic myelopathy generally does not produce enhancement, because the mechanism is compression rather than inflammation. So an enhancing intramedullary lesion should, in theory, point toward MS.

But as the case reports described earlier showed, some patients with cervical spondylosis had what appeared to be enhancing intramedullary lesions on initial imaging.² This can occur when severe compression causes local ischemia and breakdown of the blood-spinal cord barrier. The enhancement pattern may look similar enough to an inflammatory lesion that a neurologist interprets it as demyelinating disease. This is exactly the kind of scenario that leads to years of inappropriate immunotherapy before the true diagnosis emerges.

The lesson is that no single MRI feature should be interpreted in isolation. Enhancement, lesion location, lesion morphology, brain findings, clinical history, and lab tests all need to be weighed together. When the pieces do not fit neatly, repeat imaging over time can be revealing: MS lesions tend to change, with new ones appearing and old ones evolving, while compression-related changes tend to be stable unless the stenosis worsens.

Emerging Imaging Tools

Standard MRI has served as the backbone of both MS and spinal stenosis diagnosis for decades, but newer techniques are beginning to offer additional information. Diffusion tensor imaging, a specialized MRI technique, can map the directional flow of water molecules along nerve fibers. In MS, demyelination disrupts this flow in characteristic ways that differ from simple mechanical compression. Research has established its usefulness in evaluating what appears to be normal-looking white matter on standard scans, capturing microstructural changes that routine imaging misses.⁴ This is particularly relevant for the diagnostic overlap problem, because it could theoretically distinguish whether a spinal cord abnormality reflects demyelination or compression, even when standard images are ambiguous.

These advanced techniques remain largely in the research realm and are not yet part of routine clinical workups for most patients. But as they become more widely available, they may help resolve the harder diagnostic cases where conventional imaging and clinical features leave genuine uncertainty about whether the patient is dealing with MS, spinal stenosis, or both.

1
PubMed Central. Degenerative Cervical Myelopathy Diagnosis and Its Differentiation from Neurological Mimics, MS and ALS: A Literature Review
2
Multiple Sclerosis and Related Disorders. Cervical spondylotic myelopathy mimicking transverse myelitis
3
Archives of Neurology. Cerebrospinal Fluid Oligoclonal IgG Bands in Patients With Spinal Arteriovenous Malformation and Structural Central Nervous System Lesions
4
PubMed Central. Advanced Diffusion MR Imaging for Multiple Sclerosis in the Brain and Spinal Cord
5
PubMed Central. Central neuropathic pain in MS is due to distinct thoracic spinal cord lesions
6
The Spine Journal. Association of postoperative outcomes with preoperative magnetic resonance imaging for patients with concurrent multiple sclerosis and cervical stenosis
7
ScienceDirect. Cervical stenosis and multiple sclerosis: A retrospective case-control study
8
PubMed Central. Is surgery beneficial for patients with concurrent multiple sclerosis and degenerative cervical myelopathy? A review of literature
9
The Spine Journal. Surgical outcomes in patients with coexisting multiple sclerosis and cervical stenosis
10
PubMed. Surgical outcome in patients with coexisting multiple sclerosis and spondylosis