science

Spinal cord compression

Spinal cord compression is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Spinal cord compression rather than just read about it. In short: Spinal cord compression is a form of myelopathy in which the spinal cord is compressed. Causes can be bone fragments from a vertebral fracture, a tumor, abscess, ruptured intervertebral disc or other lesion.

Key takeaways

Spinal cord compression belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Spinal cord compression to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Spinal cord compression from memory before moving on to harder problems.

Reference excerpt

Spinal cord compression is a form of myelopathy in which the spinal cord is compressed. Causes can be bone fragments from a vertebral fracture, a tumor, abscess, ruptured intervertebral disc or other lesion. When acute it can cause a medical emergency independent of its cause, and require swift diagnosis and treatment to prevent long-term disability due to irreversible spinal cord injury.

Signs and symptoms Symptoms suggestive of cord compression are back pain, a dermatome of increased sensation, paralysis of limbs below the level of compression, decreased sensation below the level of compression, urinary and fecal incontinence and/or urinary retention. Lhermitte's sign (intermittent shooting electrical sensation) and hyperreflexia may be present.

Progression Typically, the symptoms of spinal cord compression develop slowly and progress steadily over several years. In some patients, however, the condition may worsen more rapidly. Subacute compression develops over days to weeks. Acute compression develops within minutes to hours. Acute compression may follow subacute and chronic compression, especially if the cause is abscess or tumor. Regardless of the pace, spinal cord compression will predictably progress over time.

Causes The most common causes of cord compression are tumors, but abscesses and granulomas (e.g. in tuberculosis) are equally capable of producing the syndrome. Tumors that commonly cause cord compression are lung cancer (non-small cell type), breast cancer, prostate cancer, renal cell carcinoma, thyroid cancer, lymphoma and multiple myeloma.

Diagnosis

Diagnosis is by X-rays but preferably magnetic resonance imaging (MRI) of the whole spine.

Treatment Dexamethasone (a potent glucocorticoid) in doses of 16 mg/day may reduce edema around the lesion and protect the cord from injury. It may be given orally or intravenously for this indication. Surgery is indicated in localised compression as long as there is some hope of regaining function. It is also occasionally indicated in patients with little hope of regaining function but with uncontrolled pain. Postoperative radiation is delivered within 2–3 weeks of surgical decompression. Emergency radiation therapy (usually 20 grays in 5 fractions, 30 grays in 10 fractions or 8 grays in 1 fraction) is the mainstay of treatment for malignant spinal cord compression. It is very effective as pain control and local disease control. Some tumours are highly sensitive to chemotherapy (e.g. lymphomas, small-cell lung cancer) and may be treated with chemotherapy alone.

Prognosis Once complete paralysis has been present for more than about 24 hours before treatment, the chances of useful recovery are greatly diminished, although slow recovery, sometimes months after radiotherapy, is well recognised. The median survival of patients with metastatic spinal cord compression is about 12 weeks, reflecting the generally advanced nature of the underlying malignant disease.

See also Spinal stenosis Cervical spinal stenosis Myelopathy

References

Loblaw DA, Perry J, Chambers A, Laperriere NJ (March 2005). "Systematic review of the diagnosis and management of malignant extradural spinal cord compression: the Cancer Care Ontario Practice Guidelines Initiative's Neuro-Oncology Disease Site Group". J. Clin. Oncol. 23 (9): 2028–37. doi:10.1200/JCO.2005.00.067. PMID 15774794.

External links

Illustrations

Worked examples

Example 1 — a first encounter with Spinal cord compression

Start with the simplest possible case. Write down what Spinal cord compression claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Spinal cord compression before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Spinal cord compression ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Spinal cord compression

In research: Spinal cord compression appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Spinal cord compression in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Spinal cord compression is common in secondary-school and first-year university syllabi. It links to neighbouring topics Medical emergencies, Oncological emergencies, so understanding it makes those chapters shorter.
In everyday life: Look for Spinal cord compression outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Spinal cord compression in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Spinal cord compression means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Spinal cord compression out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Spinal cord compression in simple terms?

Why does Spinal cord compression matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Spinal cord compression?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Spinal cord compression.