Conditions · Carrollwood · Tampa Bay
Herniated Disc & Bulging Disc
What the words on your MRI report actually mean, what they do and do not tell you, and how a doctor trained in spinal MRI interpretation connects the picture to the person.
A radiology report is written for other doctors, not for you. So when yours says disc protrusion, extrusion, annular tear, or herniated nucleus pulposus, the words land without a translator, and the internet fills the silence badly. This page is the translator. Dr. Bobby Koser, DC, chiropractic physician, completed post-doctoral training in spinal MRI interpretation and clinical correlation, and reviewing the report with the person it belongs to is part of the examination here. Bring yours.
Herniated and Bulging Disc Overview
What the words on your report mean
A spinal disc is a cushion between two vertebrae: a tough outer ring of fibers called the annulus, wrapped around a soft center called the nucleus. Nearly every term on a disc report describes some version of the same event, the soft center pushing against or through the outer ring. The words differ by how far it has gone.
Bulging disc
The outer ring is intact but sags outward beyond its normal footprint, the way a tire bulges under load. The soft center has not broken through. As the research below shows, bulges appear on the scans of people with symptoms and people without them, so a bulge on your report is where the examination starts, not where it ends.
Herniated disc
The general term for the soft center pushing into or through a weakness in the outer ring. Radiologists usually grade how far it has gone:
- Protrusion: the center pushes into the ring and deforms it, but stays contained.
- Extrusion: the center breaks through the ring, though it stays connected to the disc.
- Sequestration: a fragment breaks free entirely and sits in the spinal canal.
Also written as: herniated nucleus pulposus, or HNP, which is the same thing in anatomical language. A slipped disc, ruptured disc, prolapsed disc, or torn disc are everyday names for the same family of findings; discs do not actually slip out of position.
Annular tear, or annular fissure
A tear or fissure in the fibers of the outer ring itself, with or without anything pushing through it. Radiologists increasingly write annular fissure on reports, and some use the two terms interchangeably; they describe the same finding. It can accompany a herniation or appear on its own.
Degenerated or collapsed disc
Loss of disc height and water content, which is a wear pattern rather than a rupture. Reports describe it as degenerative disc disease or disc desiccation. It often appears on the same report as a bulge, because the two travel together with age.
A finding is not a diagnosis
Here is the single most useful thing to know before you read your report again. In a large research review of spine scans from 3,110 people with no symptoms, disc bulges showed up in about 30% of 20-year-olds and about 84% of 80-year-olds, and disc protrusions in about 29% of 20-year-olds.1 In that review, findings like these were common in people without symptoms, and grew more common with age.
That cuts in both directions, and both matter. A finding on your report is not automatically the cause of your pain, so treating the picture instead of the person can mean treating the wrong thing. And the reverse is just as true: your pain is not less real because the same words appear on other people’s reports. Whether a finding explains your symptoms depends on where it is, which nerve it could affect, and whether that matches what you actually feel, and working that out is what an examination is for. The report is the starting point. The exam connects it to you.
1. Brinjikji W, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol. 2015;36(4):811-816. PubMed
Can a herniated disc shrink without surgery?
In some cases, but not all. In a systematic review of follow-up imaging studies, a portion of lumbar disc herniations shrank during a course of nonsurgical care, and the larger herniation types regressed most often: spontaneous shrinkage was seen in about 96% of sequestrations, the free fragments, 70% of extrusions, 41% of protrusions, and 13% of bulges.2 Put the other way, some herniations in every category did not shrink, and most bulges did not.
Shrinking on a scan is not the same as feeling better, complete disappearance was much less common than partial shrinkage, everyone in those studies was under active nonsurgical care with monitoring rather than simply waiting, and these are group probabilities. What they support is a reasonable, monitored trial of conservative care for many disc herniations, with escalation when the examination says so.
2. Chiu CC, et al. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clin Rehabil. 2015;29(2):184-195. PubMed
Symptoms, and the warning signs we screen for
A disc problem can hurt where it lives, most often the low back or neck. When disc material presses on a nearby nerve, the symptoms travel: pain, tingling, or numbness running down a leg, the pattern many people know as sciatica, or down an arm from the neck. Weakness in the foot or hand, pain that worsens with sitting, coughing, or sneezing, and pain that follows a line rather than sitting in a spot all point toward a nerve being involved.
Common, and examined here
- Back or neck pain with a disc finding on a report
- Pain, tingling, or numbness running down a leg or arm
- Pain that is worse with sitting or bending
- An MRI report you have never had explained to you
Emergency, not an appointment
- New loss of bowel or bladder control
- Numbness in the groin or inner thighs
- Rapidly worsening leg weakness
Together these can signal cauda equina syndrome, a surgical emergency. Go to the emergency department now. This is part of what the examination here screens for.
How we approach a disc problem
The examination comes first, every time: your history, a physical and neurological examination, and your imaging report read with you, not at you. Dr. Koser’s post-doctoral training in spinal MRI interpretation and clinical correlation exists for exactly this conversation, and years of helping flag potential surgical spine cases for referral, alongside neurosurgeons, came before this practice. The question the visit answers is the one that matters: does the finding on the report explain the person in the room?
When conservative care fits, it is built from the examination: gentle techniques including flexion-distraction, which stretches the spine slowly with no thrust, dry needling for the muscles guarding the area, and a plan for movement you can actually follow, monitored so the plan changes if you do not. When the examination points somewhere else, a nerve losing strength, a case that belongs in front of a surgeon, symptoms that do not add up, we say so, refer you to the right physician, and send your records with you. Surgery decisions belong with surgeons; making sure you are in the right room is part of the job here.
Hurt in a car accident? Disc injuries after a crash run through a different door: Florida’s PIP law requires care to begin within 14 days. Start at our auto accident page.
What the research shows
The two studies below are randomized trials, studies where people agreed to let chance assign them to surgery or to nonsurgical care so the two paths could be compared fairly.
In the first trial, 501 people who were candidates for surgery, each with a lumbar disc herniation confirmed on imaging and leg symptoms from the irritated nerve that had lasted at least six weeks, were assigned either to surgery or to nonsurgical care. Many people ended up switching from the group they were assigned to, in both directions, and the authors cautioned that because of this the trial could not say whether surgery or nonsurgical care was better, or whether the two were equal. What it could say is that both groups improved substantially over the two years.3
In the second trial, 283 people whose sciatica, leg pain caused by a lumbar disc herniation irritating the nerve that runs down the leg, had lasted six to twelve weeks were assigned either to early surgery or to continued nonsurgical care with surgery still available if needed. Early surgery was linked to faster relief of leg pain in the early months, a head start that was no longer significant by six months. In the nonsurgical group, 44% eventually had surgery after all, and at two years 20% of all patients, one in five across both groups, rated their outcome as unsatisfactory. Across the full two years, though, overall disability scores were similar between the two groups.4
In both trials, these are group results in people already being considered for surgery, not a prediction for you, and finding out where you actually stand is what the examination is for.
3. Weinstein JN, et al. Surgical vs nonoperative treatment for lumbar disk herniation: the Spine Patient Outcomes Research Trial (SPORT): a randomized trial. JAMA. 2006;296(20):2441-2450. PubMed
4. Peul WC, et al. Prolonged conservative care versus early surgery in patients with sciatica caused by lumbar disc herniation: two year results of a randomised controlled trial. BMJ. 2008;336(7657):1355-1358. PubMed
Common questions about herniated discs
Is a bulging disc the same as a herniated disc?
No. In a bulge the outer ring is intact and sags outward; in a herniation the soft center pushes into or through the ring. Radiologists grade herniations further as protrusion, extrusion, or sequestration, in order of how far the material has gone.
My MRI found a disc bulge. Is that why I hurt?
Not necessarily, and this is worth taking seriously in both directions. Disc bulges showed up in about 30% of 20-year-olds and about 84% of 80-year-olds who had no symptoms at all, so a bulge alone does not settle the question. Whether your finding explains your symptoms depends on whether its location matches what you feel, and that is what the examination works out.
Will my herniated disc heal without surgery?
Some do, and some do not. In follow-up imaging studies, a portion of herniations shrank during a monitored course of nonsurgical care, and the larger herniation types shrank most often, but some in every category did not change. Those are group probabilities, not a prediction for your disc, which is why care here is monitored rather than assumed: if you are not progressing, the plan changes, and if the examination says you need a surgeon, we refer you.
What is a slipped disc?
An everyday name for a herniated disc. Discs do not actually slip out of place; the soft center pushes through the outer ring. Ruptured disc, prolapsed disc, torn disc, and HNP all describe the same family of findings.
Do I need an MRI before coming in?
No. The examination decides whether imaging is needed. If you already have an MRI or a report, bring it: reviewing it with you is part of the visit, and it is a conversation many people have never actually been given.
Do you treat herniated discs with adjustments?
The examination decides the technique, and disc cases are where the gentler tools earn their place: flexion-distraction, which stretches the spine slowly with no thrust, instrument adjusting, and soft-tissue work. Some disc presentations should not be adjusted at all, and if yours is one of them, we tell you and treat differently or refer.
When is a disc an emergency?
New loss of bowel or bladder control, numbness in the groin or inner thighs, or rapidly worsening leg weakness can signal cauda equina syndrome. That is an emergency department visit now, not an appointment.
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This page is general health information and is not medical advice for any individual. The studies summarized describe groups, not any one person’s outcome, and whether any finding on your imaging explains your symptoms can only be determined by examination. Talk to Dr. Bobby Koser, DC, about your own situation, and seek emergency care immediately for the warning signs listed above.
Bring the report. Leave understanding it.
A complete examination with Dr. Bobby Koser, DC, your MRI report reviewed with you, and your findings explained the same day.