Report decoder · Spine
A Schmorl's node on your spine scan, and the two words that change it
Schmorl's nodes are very common, and they're usually old news. In one CT study of 180 people, 44.4% had at least one in the lower back. Each one is disc center that has pushed up or down through the endplate (the bone and cartilage surface a disc rests on) into the vertebra, not sideways toward the nerves the way a herniated disc does. The two words that would change that picture are "acute" and "surrounding marrow edema."
How it reads on a report
FINDINGS: Small Schmorl's nodes at the inferior endplates of T11 and T12 without surrounding marrow edema. Mild disc desiccation and height loss at L4-5. IMPRESSION: Small chronic-appearing Schmorl's nodes at the thoracolumbar junction. Mild degenerative disc disease at L4-5.
Schmorl's node
A small spot where disc material has pushed up or down into the bone of the vertebra next to it. They're very common, found in up to 3 in 4 people, and most cause no symptoms.
Meaning from StatPearls, Anatomy, Back, Intervertebral Discs.
The findings line puts two small nodes on the inferior endplates of T11 and T12, the bottom surfaces of the last two mid-back vertebrae, where the spine meets the lower back (the thoracolumbar junction). That's the textbook spot: nodes are usually small and sit on the lower surface of the lower thoracic and lumbar vertebrae. Two at once is ordinary too. In that same CT study, 22.2% of people had more than one. "Without surrounding marrow edema" means the bone around them isn't swollen.
The L4-5 line is a separate finding. That disc is drying out and a little thinner, which our disc desiccation guide covers. In the impression, "chronic-appearing" is the radiologist's read that the nodes look long-standing rather than acute, which is the answer you were hoping for.
The words next to it
Words you may see beside schmorl's node on a report, and what each one changes.
- Sclerotic margin
- On CT, a node typically shows a dense (sclerotic) rim of bone just under the endplate.
- Acute, with surrounding marrow edema or peripheral enhancement
- The uncommon kind, tied to inflammation and pain. Swelling in the bone around it, and a rim that lights up after contrast dye (enhancement), can make it look more aggressive on the scan.
- Disc desiccation or height loss at the same level
- Nodes keep company with disc wear. In one study, discs at levels with a node were measurably thinner than discs at levels without one.
- Versus endplate fracture or Modic change
- On MRI, a node, a small endplate fracture and a Modic change can look alike, so the radiologist may name more than one possibility.
- Vertebral wedging, Scheuermann
- Scheuermann disease is a spine condition that typically shows up between ages 12 and 17. Nodes are one of its criteria, but the label also needs at least 3 neighboring vertebrae each wedged by more than 5 degrees.
What happens next with a quiet node, and with an acute one
Most Schmorl's nodes turn up by chance on a scan done for something else. Chronic ones are "usually asymptomatic", and whether they cause back pain at all is debated. A quiet node found this way usually needs nothing beyond what the scan was ordered for.
An acute node is a different situation. It pairs pain at that level with edema in the bone around the node on MRI, and a 2012 review found that edema "in virtually all symptomatic cases".
Rarely, a node is the cause of sudden back pain, and even less often of nerve pain (radiculopathy). The doctor may also weigh an acute node against an infection in the spine. Next to an infection, an acute node tends to show more focal endplate changes, and it comes with no fever.
Questions to ask the doctor
- Is there any edema around my node, or does it look chronic?
- Does the level of the node match where my pain is?
- Do the discs at that level explain my symptoms better than the node does?
- Could this be a small endplate fracture or a Modic change instead?
- Was the node on my older scans too?
Often on the same report
Degenerative disc disease
Wear-and-tear changes in the discs, the cushions between the spine bones, as they dry out and lose height with age. It's found on scans in most people over 40, often in people who have no symptoms.
Endplate changes
Wear-related changes in the endplates, the surfaces of the vertebrae that touch the discs, and in the bone just behind them. They reflect degeneration at that level and often show up alongside disc wear.
Modic changes
Changes in the bone right next to a disc, at the top or bottom surface of a vertebra, that MRI picks up as part of disc wear. Type 1 means swelling and active inflammation and is linked to low back pain. Type 2 means the marrow there has been replaced by fat.
Disc herniation
Part or all of a disc, the cushion between two spine bones, has pushed out through a weak spot in its outer wall. This can press on nearby nerves or the spinal cord, and the lower back is the most common place for it.
- Bone marrow edema
Fluid built up in the bone marrow, the soft tissue inside the bone, seen on MRI. Causes include injuries such as stress fractures, osteoarthritis, osteoporosis, and infection. It's one of the most common MRI findings, and what it means depends on the cause.
Compression fracture
One of the spine bones has broken and been squeezed down, so it's shorter than the ones around it. Thinning bones (osteoporosis) are the most common cause. Injury and tumors that spread to bone are other causes.
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Questions people ask
- Can Schmorl's nodes be caused by trauma?
- Direct trauma to a vertebra is one suspected contributor. Nodes are also strongly linked to disc degeneration, though the studies show the two go together, not that one causes the other.
- How is a Schmorl's node treated?
- Whether a node causes symptoms or not, the "mainstay of treatment" is conservative care, meaning care without surgery. Nodes that do hurt usually settle on their own or with that care.
- Can an X-ray show a Schmorl's node?
- It can, mostly later on, once some calcification has formed around the node. MRI is the best test for finding them, and unlike a plain X-ray it can show the edema that marks an acute node.
- What are cervical Schmorl's nodes?
- They're Schmorl's nodes in the neck. Nodes can form on any vertebra, but the neck is a less usual place for one.
Other phrases explained: Pulmonary nodule · Ground-glass opacity · Aortic atherosclerosis · Bone marrow edema
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