Your MRI Report Is Not a Diagnosis: What Imaging Can and Cannot Show About Pain

What this video covers

• Why disc degeneration, bulges, and annular fissures are found in a high percentage of pain-free people, and what that means for your report
• What MRI is genuinely best at: ruling out tumor, infection, fracture, and cauda equina compression, and grading nerve root compression
• What fluoroscopy adds: live X-ray, real-time contrast, and precise needle placement into deep spinal targets, and where CT guidance is preferred instead
• What ultrasound adds: radiation-free, real-time imaging of nerves, tendons, vessels, and peripheral joints
• How a diagnostic anesthetic block tests a hypothesis rather than just treating a symptom, and why confirmatory blocks are used
• The honest limits of each approach, including false-positive rates, radiation exposure, ultrasound’s inability to see through bone, and the real if uncommon risks of the blocks themselves
• MEDICAL DISCLAIMER: This content is for educational purposes only and is not medical advice. It does not substitute for professional diagnosis or treatment. Always consult a licensed healthcare provider regarding your condition. Viewing this video does not establish a doctor-patient relationship.

You are holding a report. Degenerative disc disease at L4-L5. Disc bulge. Annular fissure. Someone said “wear and tear,” handed you a referral, and you have carried that page ever since as though it were a diagnosis. It is not. It is the description of a photograph.

That distinction is not a technicality, and it is not a criticism of the radiologist who wrote the report — the report did exactly what it was asked to do. A report describes tissue. It does not identify a pain generator: the specific structure whose signaling is producing the pain you actually feel. This article explains how MRI, fluoroscopy and ultrasound each build their picture, why a picture cannot name the source of pain, and what kind of test can.

How an MRI actually makes its picture

Magnetic resonance imaging does not photograph pain. It listens to hydrogen nuclei — protons — in your tissue. Placed in a strong magnetic field and tipped by a radiofrequency pulse, those protons relax back toward alignment, and protons sitting in different molecular environments relax at different rates. Which sequence is run decides when the scanner listens. That choice is the pulse sequence, and it determines which of those differences in relaxation becomes brightness on the screen.

This is why the same disc can look dark on one sequence and brilliant on the next. An MRI is not one picture of your spine. It is a set of weighted maps, each tuned to make a different tissue property visible.

That map is irreplaceable for one job in particular: exclusion. It is how a physician rules out tumor, discitis or epidural abscess, occult fracture, and cauda equina compression, and how the severity of nerve root compression is graded. When your history raises any of those possibilities, you are imaged immediately — no waiting, no trial of conservative care first.

Red flags that override everything else on this page

Learn these features. If any of them describe you, this article does not apply to you and you should be evaluated and imaged now, not next month:

• New loss of bowel or bladder control
• Saddle numbness — the area that would contact a bicycle seat
• Leg weakness that is getting worse week over week
• Fever with back pain
• Unexplained weight loss
• Any history of cancer
• Intravenous drug use
• Significant trauma, or even minor trauma if you have osteoporosis or take chronic steroids

Everything that follows is only safe advice because that list exists.

Why the report and the pain do not line up

Here is the part almost nobody is given time to explain. The findings printed on most spine reports are extremely common in people who feel nothing at all.

In 2015, in the American Journal of Neuroradiology, Brinjikji and colleagues reviewed 33 studies covering 3,110 people with no back pain. On imaging, disc degeneration appeared in 37% of asymptomatic 20-year-olds and 96% of asymptomatic 80-year-olds. Disc bulges ran from 30% to 84% across the age range, and annular fissures from 19% to 29%. The authors’ own conclusion was that these findings are likely part of normal aging and unassociated with pain.¹ That is a review of how often these features appear in people who were not hurting — prevalence, not causation — which is exactly why it cannot be read as a verdict on your own scan in either direction.

So the sentence on your report is, statistically, a description of a spine that has been alive for a while. It may also happen to be the source of your pain. The report cannot tell you which, because anatomy is not physiology. A picture shows structure. Pain is a process. A structure is implicated only when silencing it changes your pain.

That is also why the imaging-first reflex does not reliably help. In 2009, in The Lancet, Chou and colleagues pooled six randomized trials — 1,804 patients — comparing immediate lumbar imaging against usual care in people without red-flag features. They recorded no significant difference in pain and none in function, at short-term or long-term follow-up, and concluded that imaging without indications of a serious underlying condition does not improve outcomes.² Scanning first did not, on average, make people better.

Three tools, three different questions

Each imaging modality answers a question the others cannot.

MRI is a static anatomical map with excellent soft-tissue contrast. Best question for it: is there something dangerous here, and how compressed is that nerve root?

Fluoroscopy is live X-ray. A pulsed beam passes through you onto a detector, and the physician sees your skeleton in real time at any angle the C-arm is rotated to. Injected contrast can be watched spreading along the intended target — or running somewhere it should not, into a vessel or toward the intrathecal space. That real-time confirmation is why fluoroscopy is the usual choice for needles aimed at deep spinal targets, with CT guidance preferred for selected anatomically difficult ones. Best question for it: is this needle, right now, exactly where I intend it to be?

Ultrasound is sound, not radiation, and it shows what fluoroscopy cannot see at all: the nerve and its fascicular pattern, the tendon, the artery lying beside it, all moving in real time. Its hard limit is physics — sound does not pass through bone, so deep spinal targets shielded by bone are not its territory. Best question for it: where exactly is this peripheral nerve, tendon or vessel, and can I place a needle around it without radiation?

None of these is superior to the others in the abstract. In 2023, in Diagnostics, Viderman and colleagues meta-analyzed eight randomized trials comparing ultrasound-guided against fluoroscopy-guided interventions for back pain. For pain relief there was no significant difference between the two. For complications there was likewise no significant difference — but that estimate was imprecise enough that it cannot exclude a real difference in either direction. Disability scores trended in favor of fluoroscopy at the very edge of statistical significance, by a margin too small to matter clinically.³ Read honestly, those are non-significant findings, and on complications the imprecision means the two cannot be declared equivalent — non-significant is not the same as proven equal. The modality should be chosen by the target and your anatomy, not by fashion or by equipment availability. You can read more about how ultrasound-guided and fluoroscopic procedures are used for specific targets.

What the usual approach misses

The common path looks like this: pain, then a scan, then a report full of findings, then a series of injections aimed at something nobody ever named to you, with no stated threshold for what would count as a positive result.

Those injections were not necessarily failed treatments. They were experiments that were never designed, so they could not answer in either direction. If relief was not defined in advance, and the structure targeted was not stated in advance, then neither relief nor its absence tells you anything about where your pain comes from.

Symptom-control medication has a real and legitimate place alongside this work. What it does not do is identify which structure is generating the signal — and a diagnosis deferred long enough tends to become a diagnosis abandoned. Do not start, stop, or change any medication without consulting your physician.

What this means for your evaluation

The first move is not the scanner. It is an examination that names a suspect.

Axial pain in a paraspinal band, worse in extension and rotation, points toward the zygapophyseal (facet) joints and their nerve supply. Dermatomal pain below the knee with a positive neural tension sign points toward the nerve root and foramen. Pain over the posterior superior iliac spine on single-leg loading raises the sacroiliac joint. Lateral hip pain reproduced by direct palpation raises the gluteal tendons rather than the spine at all.

Now hear how weak those inferences are on their own. As Dr. Padda describes in the video above, when published clinical criteria for facet pain were tested against confirmatory blocks in a series of 176 patients, none of the clinical features tested was associated with who responded to the block. There is no physical examination maneuver that proves your pain is facet-mediated. Every finding above is a suspect. None is a verdict.

The verdict requires a test. A diagnostic block is an experiment, not a treatment: a precisely placed volume of local anesthetic on one structure, followed by measuring what happens to the pain you came in with, recorded on a timed diary.

The anatomy has to be exact

From L1 through L4, the medial branches of the dorsal rami cross the junction of the superior articular process and the transverse process. That bony corner is the target — not the joint named on your MRI. L5 is the exception that matters most: at L5-S1 there is no medial branch to block, so the L5 dorsal ramus itself is targeted where it crosses the sacral ala and the S1 superior articular process. Get that wrong and you have anesthetized the wrong nerve and drawn a confident conclusion from it.

One positive block is a hypothesis, not an answer

Diagnostic blocks carry a false-positive rate, and the honest thing to do is give the number rather than the adjective. As Dr. Padda reports in the video above, in a published series of 176 patients who underwent lumbar zygapophyseal blocks, 47% responded to the first block and 15% responded to the confirmatory one, and the false-positive rate of a single uncontrolled block was 38% — nearly two in five of the apparent responses did not hold up.

Because of that, a confirmatory block on a separate day is standard practice at the Padda Institute Center for Interventional Pain Management. That is a practice policy, not a trial result. It also means a substantial share of first blocks are not confirmed by the second — and when that happens, the honest reading is that the wrong structure was tested, so the process returns to the examination. Individual results vary.

What a block actually buys you

This is the misunderstanding that hurts patients more than the needle does. The relief from a diagnostic block is the anesthetic window and nothing longer — roughly one to two hours for lidocaine, several hours for bupivacaine. When it wears off on schedule, that is the test working, not failing. Its entire value is the diary you keep during those hours, including on the days that feel terrible.

Diagnostic blocks are invasive procedures. Bleeding, infection, transient nerve irritation, vasovagal reactions, and reactions to contrast or to anesthetic are uncommon but real, and risk rises if you are anticoagulated or if the target sits near the neuraxis. Fluoroscopy uses ionizing radiation, held down with pulsed acquisition and tight collimation. And blocks are not a screening test: if pain is widespread with no anatomic target, a needle will not manufacture one.

An illustrative composite — not a patient testimonial

The following is a composite assembled from many patients with this presentation, not one person’s chart. Two years of one-sided low back pain, no leg symptoms, a report listing multilevel degeneration and a bulge, and two epidural injections done elsewhere that were not aimed at what the examination pointed to. The pain is paraspinal, worse in extension and rotation, and does not travel below the knee. The MRI, read for what it is genuinely good at, is reassuring: no tumor, no infection, no fracture, no root compression. So the hypothesis is tested — a fluoroscopically guided medial branch block at the suspected levels, contrast confirmed, diary in hand for the anesthetic window. The first block gives concordant relief; a second, on a separate day, agrees. Individual results vary.

That outcome was chosen for the narration, and it is not what most first attempts return. It took weeks, not one visit. And the answer was not a cure. It was a location — a structure that had actually been tested, instead of a finding that a large share of pain-free people the same age also carry.

Frequently asked questions

Key takeaways

• An MRI is a set of weighted anatomical maps. It is irreplaceable for excluding tumor, infection, fracture and cauda equina compression, and it cannot identify which structure is producing your pain.
• Disc degeneration, bulges and annular fissures are found in large proportions of people with no pain at all — 37% of asymptomatic 20-year-olds up to 96% of asymptomatic 80-year-olds — so a report finding is not by itself a diagnosis.
• MRI, fluoroscopy and ultrasound answer three different questions; across eight randomized trials, ultrasound and fluoroscopic guidance showed no significant difference in pain relief, with the complication comparison too imprecise to be called equivalent.
• A diagnostic block is an experiment with a defined endpoint. In the published series cited in the video, a single uncontrolled block carried a 38% false-positive rate, which is why a confirmatory block on a separate day is used.
• Red-flag symptoms — new bowel or bladder changes, saddle numbness, progressive leg weakness, fever, unexplained weight loss, cancer history — mean immediate evaluation, not watchful waiting.

Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed July 2026.

This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician. To have your pain generator identified rather than guessed at, call (314) 481-5000 or text (314) 886-5902 to request an appointment.

References

1. Brinjikji W, Luetmer PH, Comstock B, Bresnahan BW, Chen LE, Deyo RA, Halabi S, Turner JA, Avins AL, James K, Wald JT, Kallmes DF, Jarvik JG. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol. 2015 Apr;36(4):811-6. PMID 254308611031744173. PubMed
2. Chou R, Fu R, Carrino JA, Deyo RA. Imaging strategies for low-back pain: systematic review and meta-analysis. Lancet. 2009 Feb 7;373(9662):463-72. PMID 192009181010160140673609601720. PubMed
3. Viderman D, Aubakirova M, Aryngazin A, Yessimova D, Kaldybayev D, Tankacheyev R, Abdildin YG. Ultrasound-guided vs. fluoroscopy-guided interventions for back pain management: a systematic review and meta-analysis of randomized controlled trials. Diagnostics (Basel). 2023 Nov 18;13(22):3474. PMID 3799861010339013223474. PubMed

Dr. Gurpreet Singh Padda, MD, MBA, MHP