An MRI report can be intimidating — it's full of technical words that can sound alarming even when they describe ordinary, age-related changes. This section translates the common terms and explains the single most important principle in reading any spine MRI.
The most important thing to understand: findings are common, even without pain
Degenerative changes on MRI are extremely common in people who have no pain at all. They are, to a large degree, a normal part of aging — like gray hair or wrinkles on the inside. Consider the evidence:
In a landmark study of people with no back pain whatsoever, 64% had a disc abnormality on MRI, including bulges in 52% and protrusions in 27%1.
A systematic review of over 3,000 pain-free individuals found that disc degeneration was present in 37% of 20-year-olds and 96% of 80-year-olds; disc bulges rose from 30% to 84% across the same ages — changes described as likely part of normal aging and unassociated with pain2.
Large studies comparing people with and without back pain have found that many degenerative features appear at nearly the same rates in both groups3.
In the neck, the picture is the same: degenerative disc findings are present in a large share of adults who have no symptoms, and the prevalence of signal loss and disc protrusion climbs steadily with age. Long-term studies following healthy volunteers have found that cervical degeneration progresses on MRI in most people, while only a minority develop symptoms.
The practical message: an MRI finding is not automatically the cause of your pain. Reports often list several findings, and some — perhaps most — may have nothing to do with how you feel2,3. Attributing symptoms to the wrong finding can lead to unnecessary worry, tests, and even procedures that don't help.
How we actually use your MRI: correlation is everything
The MRI is one piece of the puzzle. The central task is correlating the imaging with your actual symptoms and physical examination — matching the pattern of your pain, numbness, or weakness to the specific structure and nerve level that the pictures show4. A finding matters when it explains what you are experiencing; a finding that doesn't match your symptoms is noted, kept in mind, and usually watched rather than treated.
This is why two people with identical-looking MRIs can need very different care, and why I may recommend against acting on a scary-sounding finding that doesn't fit your clinical picture. It is also why we may order a targeted diagnostic test (like a selective nerve root block) when the MRI shows several possible culprits and we need to confirm which one is truly responsible5. And it's why other pathology on the report — unrelated to your current symptoms — is still acknowledged and tracked; it simply may not be what we treat today.
A glossary of common MRI terms
Terms about the disc
| Term you'll see | What it means in plain language |
|---|---|
| Disc desiccation / loss of disc signal / "dark disc" | The disc has dried out and lost water content — a very common early aging change that shows up as darkening on the scan2 |
| Disc bulge | The disc extends out evenly, like a tire spreading under weight. Common and often painless1 |
| Disc protrusion | A more focused outpouching of disc material; the "neck" is wider than the part that sticks out6 |
| Disc extrusion | Disc material pushes out through the outer wall; the part that sticks out is wider than its neck. Larger herniations like these actually tend to shrink on their own over time6 |
| Disc sequestration | A fragment of disc has broken off completely and moved away from the parent disc6 |
| Annular fissure / tear | A small crack in the tough outer ring of the disc. Common with age and frequently painless2 |
| Modic changes (Type 1 / Type 2) | Specific changes in the bone of the vertebra next to a degenerated disc. Relevant because Type 1 and 2 changes identify the subgroup who may benefit from basivertebral nerve ablation7 |
Terms about the spinal canal and nerves
| Term you'll see | What it means in plain language |
|---|---|
| Central canal stenosis | Narrowing of the main central tunnel that holds the spinal cord (neck) or the nerve bundle (low back) |
| Foraminal / lateral recess stenosis | Narrowing of the side openings where individual nerves exit the spine — a common cause of a pinched nerve6 |
| Nerve root compression / impingement / effacement | A nerve is being pressed on or crowded. Note: this can be present even in people with no symptoms, so it must match your clinical picture |
| Cord signal change / myelomalacia | A bright spot within the spinal cord on neck MRI, suggesting the cord itself has been affected by pressure — this is a finding we take seriously |
| Ligamentum flavum hypertrophy | Thickening of a ligament inside the canal that can contribute to narrowing |
| Facet arthropathy / hypertrophy | Arthritis and enlargement of the small facet joints at the back of the spine3 |
| Spondylolisthesis | One vertebra has slipped forward relative to the one below it6 |
| Spondylosis | A general, catch-all term for age-related "wear and tear" of the spine2 |
The bottom line on your MRI
Your MRI is a valuable map, but it is read in the context of you — your symptoms, your exam, and your goals. A long list of findings is normal and usually not cause for alarm1,2. The findings that matter are the ones that explain what you feel, and those are the ones we focus treatment on — while keeping an eye on anything else the scan reveals4.
This guide is for general education and does not replace a personal evaluation. If you have severe or worsening weakness, numbness in the groin or inner thighs, new loss of bladder or bowel control, fever with back pain, or pain after a significant injury, seek medical care right away — these can be signs of a problem that needs urgent attention.
Sources
- Jensen MC, et al. Magnetic resonance imaging of the lumbar spine in people without back pain. New England Journal of Medicine. 1994. PubMed
- Brinjikji W, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. American Journal of Neuroradiology. 2015. PubMed
- Jamaludin A, et al. ISSLS Prize in Clinical Science 2023: comparison of degenerative MRI features of the intervertebral disc between those with and without chronic low back pain. European Spine Journal. 2023. PubMed
- McDonald MA, et al. ACR Appropriateness Criteria: cervical neck pain or cervical radiculopathy. Journal of the American College of Radiology. 2019. PubMed
- Oliveira CB, et al. Epidural corticosteroid injections for lumbosacral radicular pain. Cochrane Database of Systematic Reviews. 2020. PubMed
- Deyo RA, Mirza SK. Herniated lumbar intervertebral disk. New England Journal of Medicine. 2016. PubMed
- Sayed D, et al. Best practice guidelines on the diagnosis and treatment of vertebrogenic pain with basivertebral nerve ablation (ASPN). Journal of Pain Research. 2022. PubMed