You finally got your MRI results — and the report reads like it was written in another language. Desiccation. Annular fissure. Foraminal narrowing. Broad-based protrusion. If your first reaction was to search those words one at a time and feel more worried with each result, you are not alone. Radiology reports are written by physicians for physicians, and the vocabulary can sound far scarier than what it actually describes.
This guide walks through the most common findings we see on lumbar and cervical MRI reports, in plain English, with simple illustrations. One important idea to hold onto as you read: many of these findings are extremely common, and many appear in people with no pain at all. An MRI finding is a piece of the puzzle — it only means something when it is matched to your symptoms and your physical exam.
First, a 60-second anatomy lesson
Your spine is a stack of bones called vertebrae. Between each pair of vertebrae sits a disc — a small cushion that absorbs shock and lets your spine bend. Every disc has two parts: a soft, gel-like center called the nucleus pulposus, and a tough outer wall of layered fibers called the annulus fibrosus. The classic comparison is a jelly donut: soft center, firmer outside.
Behind the discs runs the spinal canal, which houses the spinal cord and its nerves. At every level, a pair of nerves exits the spine through small side openings called foramina — one on the left, one on the right. Most of the vocabulary on your MRI report describes one of three things: the condition of a disc, the condition of those nerve openings, or whether anything is pressing on a nerve.
What is disc desiccation?
Desiccation simply means drying out. A young, healthy disc is roughly 80 percent water, which is what makes it plump and springy. As discs age — or after injury — they gradually lose water content. On an MRI, a well-hydrated disc appears bright; a desiccated disc appears darker and often a bit flatter.
Desiccation is one of the most common findings on any adult spine MRI, and by itself it is not a diagnosis of anything dangerous. Think of it as gray hair for your discs. It matters most when it is advanced, when the disc has lost significant height, or when it appears alongside other findings on this list. Widespread drying and height loss across several levels is often labeled degenerative disc disease.
What is an annular tear?
Remember the tough outer wall of the disc — the annulus? An annular tear (your report may say annular fissure) is a small crack or split in those outer fibers. The gel center is still contained, but the wall itself has a weak spot. Because the outer third of the annulus contains pain-sensitive nerve endings, some annular tears cause very real, localized back pain, while others cause no symptoms and are discovered incidentally.
An annular tear is also worth understanding because it is often the first chapter of the story that leads to the next several terms: a weakened wall is what allows disc material to push outward.
Bulge, herniation, protrusion, extrusion, sequestration — what is the difference?
These five words describe a spectrum: how far disc material has moved from where it belongs, and in what shape.
A disc bulge means the disc has spread outward in a broad, symmetric way — picture a donut that has been gently squashed so its edge pushes out evenly all the way around. A bulge involves a large portion of the disc’s circumference and is extremely common with age. We cover this in more depth on our bulging disc page.
A herniation is the umbrella term for disc material pushing out through a weakness in a focused spot, rather than broadly. Radiologists then describe the shape of that herniation. More on herniated discs.
A protrusion is a herniation where the bump is wider at its base than at its tip — a broad-based push outward. The displaced material is still connected to, and continuous with, the rest of the disc.
An extrusion is a herniation where the escaped material has squeezed out through a narrower opening, so the blob outside is bigger than the neck it came through — like toothpaste squeezed from a tube. It is still attached to the disc, but it has traveled further.
A sequestration (or sequestered fragment) is an extrusion that has gone one step further: a piece of the disc material has broken off entirely and is now a free fragment sitting in the spinal canal, no longer connected to its disc.
Why does the shape matter? Because it helps your provider understand how much material may be contacting a nerve, how the problem is likely to behave over time, and which treatments make sense. It is worth knowing that even extrusions can shrink substantially on their own or with conservative care — the word sounds dramatic, but it is not automatically a surgical problem.
What is foraminal narrowing?
The foramina are the small doorways on each side of the spine where nerves exit on their way to your arms or legs. Foraminal narrowing (also called foraminal stenosis) means one of those doorways has become smaller — usually because a nearby disc has lost height, bulged into the opening, or because bone spurs and thickened joints have crowded the space.
A narrowed doorway is not painful by itself. The trouble starts when the nerve passing through it gets squeezed. That is when people feel symptoms that travel — pain, tingling, numbness, or weakness running down an arm or leg, depending on which level of the spine is involved. In the low back, that traveling pattern is often called sciatica. Your report may grade narrowing as mild, moderate, or severe; that grade, matched against your symptoms, helps guide treatment.
A close cousin you might also see is central canal stenosis — narrowing of the main canal that houses the spinal cord itself, rather than the side exits. More on spinal stenosis.
Other terms you might see
Degenerative disc disease sounds alarming but is not a “disease” in the way that phrase suggests — it is the collective label for age- and wear-related disc changes like desiccation and height loss. Nerve root impingement or compression means something, usually disc material or bone, is contacting or pressing on a nerve; in everyday language that is a pinched nerve. Facet arthropathy refers to arthritis-type changes in the small joints at the back of the spine. Spondylosis is a general term for spinal wear-and-tear, and radiculopathy describes the symptom pattern — traveling pain, numbness, or weakness — caused by an irritated nerve root.
A quick tip on reading the report itself
Radiology reports usually have two sections. The findings section walks level by level down your spine (L1-2, L2-3, and so on) and describes everything the radiologist sees, significant or not. The impression at the end is the summary — the handful of findings the radiologist considers most meaningful. If you only read one section, read the impression.
And pay attention to the grading words: mild, moderate, and severe are doing real work in that report, and “mild” genuinely means mild. A report listing six findings that are all graded mild is a very different situation from a report with one finding graded severe — even though the six-finding report looks scarier at first glance.
The most important thing your MRI cannot tell you
Here is what surprises most patients: studies of pain-free adults consistently find bulges, desiccation, and even protrusions in people who feel perfectly fine. That is why no responsible provider treats an image — we treat a person. The MRI is a map, and your symptoms, history, and physical exam tell us where on that map your pain is actually coming from. Sometimes the scariest line on the report is irrelevant, and a modest finding at a different level is the true culprit.
That matching process — findings to symptoms to exam — is exactly what a thorough evaluation is for. It is also what determines which conservative options fit your situation, from chiropractic care and physical therapy to non-surgical spinal decompression for appropriate disc-related cases, through interventional pain management and, only when genuinely needed, a surgical consult.
At TriMed Spine & Joint, we will walk through your images with you, explain what each finding means in plain language, and match those findings to a thorough exam before recommending anything. Bring the report and the disc or link if you have them.
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Frequently Asked Questions About MRI Reports
Does a disc bulge on my MRI mean I need surgery?
Usually not. A bulge is one of the most common findings on adult spine MRIs and is frequently seen in people with no pain at all. Surgery is considered based on your symptoms, your exam, and how you respond to conservative care — not on the wording of a report.
What is the difference between a disc bulge and a herniated disc?
A bulge is a broad, even spreading of the disc around a large part of its circumference. A herniation is a more focused push of disc material through a weak spot in the outer wall. Bulges are generally the milder, more age-related of the two.
Is an annular tear serious?
It can be a genuine source of localized back pain because the outer wall of the disc contains pain-sensitive nerve endings, but many annular tears are found incidentally and cause no symptoms at all. Its significance depends on whether it matches where your pain actually is.
Can a herniated disc heal on its own?
Many do improve. The body can reabsorb displaced disc material over time, and larger extrusions in particular are known to shrink. Conservative care is aimed at controlling symptoms and reducing nerve irritation while that process happens.
What does mild foraminal narrowing mean?
It means the side opening where a nerve exits the spine is somewhat smaller than normal, but only slightly. Narrowing alone does not cause pain — symptoms appear when the nerve passing through is actually compressed or irritated.
Is disc desiccation reversible?
Disc drying is largely an age-related change and is not simply reversed. The practical goal is managing the symptoms and mechanical stress that come with it, maintaining disc height and mobility, and preventing further loss.
Should I bring my MRI report and images to my appointment?
Yes. Bring both the written report and the images if you have them on a disc or portal link. Reviewing the actual images alongside your exam gives a far more accurate picture than the report text alone.
Which MRI findings should prompt urgent attention?
Severe or rapidly worsening pain, progressive weakness, numbness in the groin or inner thighs, or any loss of bowel or bladder control are reasons to seek immediate medical care, regardless of what the report says.
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