A spinal cord stroke happens when blood flow to the spinal cord is blocked or interrupted, damaging the nerve tissue that carries signals between the brain and the rest of the body. It works on the same principle as a stroke in the brain, but it targets the spine instead, and it’s far less common. Spinal cord strokes account for roughly 1% to 2% of all strokes, partly because the spinal cord has an unusually rich network of overlapping blood vessels that provide backup circulation.
How Blood Reaches the Spinal Cord
The spinal cord gets its blood supply from three main arteries that run along its length. The anterior spinal artery is a single vessel running down the front of the cord, supplying roughly the front two-thirds. Two smaller posterior spinal arteries supply the back third. These arteries don’t work alone. They’re fed by a series of feeder vessels that branch off the aorta (the body’s largest artery) and, at the top and bottom of the spine, from branches of arteries near the collarbone and pelvis.
The most clinically important of these feeder vessels is the artery of Adamkiewicz, which enters the spinal canal from the left side, typically between the mid-back and upper lumbar region (T8 to L2). This single artery is the dominant blood supply for the lower portion of the spinal cord. When it gets blocked, the consequences can be severe, because there’s no equally strong backup in that area. The mid-thoracic segment of the cord is particularly vulnerable to reduced blood flow because the anterior spinal artery is thinnest there.
Common Causes
The most frequent cause of spinal cord stroke is a problem with the aorta. Aortic surgery, aortic aneurysm repair, and conditions like aortic dissection (a tear in the aortic wall) can all disrupt the feeder arteries that supply the spinal cord. Atherosclerosis, the same buildup of fatty plaques that causes heart attacks and brain strokes, can narrow or block these vessels over time.
Other causes include blood clots that travel from elsewhere in the body, severe drops in blood pressure during surgery or cardiac events, and inflammation of blood vessels (vasculitis). In some cases, tiny fragments of cartilage from a spinal disc can break off and lodge in a spinal artery, a condition called fibrocartilaginous embolism. This is more common in younger patients and can occur after physical exertion or minor trauma. Sometimes no clear cause is identified at all.
Symptoms and How Quickly They Appear
Spinal cord strokes come on suddenly. The hallmark symptom is rapid-onset weakness in both legs. Depending on where along the spine the blockage occurs, the arms may also be affected. In some cases, symptoms appear on only one side of the body. Most symptoms develop within minutes to a few hours and may include:
- Sharp or burning back pain that may radiate into the arms or legs
- Loss of sensation, particularly the ability to feel pain and temperature changes
- Paralysis, with loss of reflexes
- Loss of bladder or bowel control
- Sexual dysfunction
- Blood pressure changes
If the blockage occurs high in the neck (the cervical spine), it can impair the nerves that control breathing, leading to respiratory failure. This is the most dangerous location for a spinal cord stroke.
Anterior vs. Posterior Spinal Cord Strokes
Most spinal cord strokes affect the anterior (front) spinal artery, because it’s a single vessel responsible for a large territory of cord tissue. Anterior spinal artery syndrome produces a recognizable pattern: paralysis and loss of pain and temperature sensation below the level of injury, but with preserved ability to feel light touch and know where your limbs are in space. That’s because the sensory pathways for touch and position run through the back of the cord, which is supplied by different arteries.
Posterior spinal artery strokes are much rarer, thanks to the paired arteries and their extensive connections. When they do occur, the pattern is essentially reversed: patients lose the sense of position and fine touch while retaining pain and temperature sensation.
How It’s Diagnosed
Diagnosing a spinal cord stroke can be tricky because the initial MRI may appear completely normal. Standard T2-weighted MRI sequences eventually show abnormalities in more than 90% of cases, but these changes can take hours to days to become visible. On imaging, the infarction typically appears as a long, pencil-shaped bright signal running through the center of the cord, often spanning more than two vertebral segments. On cross-sectional images, two bright spots in the front of the cord create what radiologists call an “owl’s eyes” or “snake eyes” pattern, reflecting damage concentrated in the gray matter of the anterior horns.
Diffusion-weighted MRI, the same technique that detects brain strokes early, can pick up spinal cord infarction sooner than standard sequences, though imaging the spine with this method is technically more challenging due to motion and distortion artifacts. The first priority during workup is ruling out a mass compressing the spinal cord, such as a tumor or blood clot pressing on the cord from outside, because that requires a completely different and often urgent surgical treatment.
Several other conditions can mimic a spinal cord stroke, including transverse myelitis (an inflammatory condition), multiple sclerosis flares, viral infections of the cord, spinal cord hemorrhage, and neurosarcoidosis. The sudden onset of symptoms is often the key distinguishing feature, since inflammatory and infectious conditions tend to develop over days rather than minutes.
Treatment Options
There is no established, standardized treatment protocol specifically for spinal cord strokes. In practice, management borrows heavily from brain stroke guidelines. Most patients receive antiplatelet therapy (medications that prevent blood clots from forming) once the diagnosis is confirmed. Blood pressure management is critical in the acute phase, since the damaged cord is sensitive to further drops in blood flow. Doctors also address underlying cardiovascular risk factors like high cholesterol, diabetes, and smoking.
Unlike brain strokes, where clot-busting drugs are used routinely within a time window, thrombolysis has been used only rarely in spinal cord strokes. In a large systematic review, only 2 out of hundreds of documented patients received it. The rarity of the condition has made it nearly impossible to run the kind of large clinical trials needed to establish firm treatment guidelines.
Intensive neurological rehabilitation is the cornerstone of recovery. Physical therapy, occupational therapy, and bladder management programs begin as soon as the patient is medically stable.
Recovery and Long-Term Outlook
Recovery from a spinal cord stroke varies widely and depends heavily on the severity of the initial injury. A study published in the journal Stroke that followed patients long-term found that 41% regained full walking ability, 30% could walk with assistive devices, 20% remained wheelchair-bound, and 9% died. Overall, 46% of patients experienced meaningful clinical improvement during follow-up.
The initial severity is the strongest predictor. Patients with mild deficits at presentation had the best outcomes: 68% walked independently, and only about 5% ended up in a wheelchair. Those with complete loss of motor function fared far worse. Among the most severely affected patients, most remained dependent on a wheelchair, and only a minority regained any walking ability even with aids.
Recovery tends to plateau after the first several months of rehabilitation, though gradual improvements can continue beyond that. Long-term challenges often include chronic pain, spasticity (muscle stiffness), ongoing bladder and bowel issues, and the psychological impact of sudden disability. Many patients need sustained rehabilitation support well beyond the acute recovery phase.