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Textbook/Clinical imaging and interpretation/Spinal MRI and cord compression
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Spinal MRI and cord compression

Use MRI to localise spinal cord, conus and cauda equina compression, distinguish malignant, degenerative, infective and haemorrhagic causes, and preserve the cause-specific emergency timing that follows the clinical syndrome.

27 min full readUK scopeSources checked 13 Sept 2026Clinical review pending
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Neurological compression is a time-critical syndrome

New weakness, gait loss, sensory level, saddle change or bladder, bowel or sexual dysfunction can reflect reversible neural compression even when pain is mild or bladder residual is low.

Action: Document the neurological trajectory, contact the appropriate spinal or MSCC team immediately, protect airway and spine when indicated, and obtain the cause-specific urgent MRI without waiting for late deficits.

Open the sections you need. The overview is shown first.
01Purpose and principlesWhat the assessment is for and the core concepts behind it.

Spinal MRI separates cord, conus and cauda equina syndromes. Cord compression can cause upper-motor-neuron signs below the lesion, a sensory level and autonomic dysfunction. Conus lesions may mix upper- and lower-motor-neuron findings, while cauda equina disease produces root pain, lower-motor-neuron weakness and sacral dysfunction. Early symptoms can precede objective weakness.

T1-weighted sequences define marrow and anatomy; T2 and STIR show oedema, CSF-space loss and many lesions; axial images confirm side and neural compromise. Gadolinium helps define epidural infection, tumour and postoperative enhancement but is not required for every disc prolapse. Diffusion can support abscess assessment but is technically challenging in the spine.

Imaging urgency is determined before the scan by cause and neurological state. Disc-related suspected CES uses the GIRFT emergency pathway. Malignant cord or cauda compression uses NG234. Sepsis, trauma, postoperative deterioration and anticoagulant-associated pain-deficit syndromes have additional parallel actions. One generic “urgent MRI” label loses the thresholds that matter.

Key points

  • MRI is the preferred examination for non-traumatic cord and cauda equina compression because it shows neural tissue, epidural space, marrow, discs and soft tissue across multiple levels.
  • Localise clinically before scanning, but extend coverage when symptoms do not fit one level or when malignancy, infection or multifocal disease makes discontinuous lesions plausible. In suspected CES, a lumbosacral scan without cauda equina compression must be followed by a sagittal T2 screen of the cervical and thoracic spine.
  • A normal radiograph or routine CT does not exclude epidural tumour, abscess, haematoma or disc compression; CT myelography is a specialist alternative when MRI is genuinely impossible.
  • The MRI protocol follows the cause: whole-spine sagittal sequences plus axial images through abnormalities for MSCC, and contrast-enhanced imaging when infection or tumour extent requires it.
  • MRI findings must match the examination: degenerative narrowing is common, while treatment urgency depends on neural compression, signal change, instability and the patient’s trajectory.
  • Do not merge timing rules: four hours from request is the national suspected disc-CES MRI target, whereas neurological MSCC requires whole-spine MRI within 24 hours.
02Indications, selection and cautionsWhen it is useful, when urgency changes and important limitations.
Cord syndromeRed flag

Look for bilateral weakness, hyperreflexia, extensor plantars, a sensory level, gait change and sphincter symptoms. High cervical disease can threaten ventilation.

Cauda equina syndromeRed flag

Ask directly about urinary filling, initiation and flow sensation, perianal sensation, bowel awareness and sexual function; retention is a late phenotype.

Malignant compressionRed flag

Cancer with progressive mechanical or night pain raises spinal metastasis; add any neurological symptom or sign and the case becomes an oncological emergency.

Infective compressionRed flag

Fever may be absent. Focal pain, bacteraemia, immune compromise, injected-drug exposure or recent procedure plus neurological change justifies urgent infection imaging.

Haemorrhagic compressionRed flag

An abrupt pain-then-deficit sequence, anticoagulant exposure or recent neuraxial procedure should prompt immediate MRI and drug-specific haemostasis review.

Degenerative background

Canal stenosis and disc bulges are prevalent, especially with age. Attribute symptoms only when level, side, neural structure and clinical pattern are concordant.

Red flags requiring action

  • Recent new urinary-flow sensation, saddle sensation, bowel awareness or sexual-function change with back or leg symptoms activates the suspected CES pathway; a low post-void residual does not exclude compression.
  • For suspected disc-related CES, the March 2026 GIRFT pathway requires emergency MRI as soon as possible and within four hours of the radiology request at the presenting hospital where possible.
  • Known cancer plus neurological symptoms or signs requires immediate MSCC-service contact and whole-spine MRI as soon as possible, always within 24 hours.
  • Fever, bacteraemia, immune compromise or recent spinal procedure with focal pain and deficit raises spinal infection; obtain urgent MRI without and with contrast while sepsis and surgical pathways proceed.
  • Abrupt severe axial pain followed by rapid neurological loss, especially with anticoagulation or neuraxial intervention, suggests epidural haematoma and needs immediate spinal, anaesthetic and haemostasis escalation.
03Method and interpretationA systematic approach to the test and its findings.
Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

  1. 01
    Emergency lumbosacral MRI for suspected CESFirst step
    Why
    Confirm or exclude cauda equina compression and identify disc, tumour, infection, blood or another cause within the national emergency pathway.
    Interpretation and limitations
    For qualifying recent ongoing symptoms, complete as soon as possible and within four hours of the radiology request. Low residual or normal limb power does not gate imaging. Start with a sagittal T2 lumbosacral screen. Demonstrated cauda equina compression requires additional axial T2 and sagittal T1 images; when compression is absent, add a sagittal T2 cervical-and-thoracic screen.
  2. 02
    Whole-spine MRI for suspected MSCC
    Why
    Identify all metastatic levels, epidural tumour, cord or cauda compromise and associated instability features.
    Interpretation and limitations
    With neurological symptoms or signs, scan as soon as possible and within 24 hours. Pain-only suspected metastasis without MSCC follows the within-one-week route.
  3. 03
    MRI without and with contrast for suspected infection
    Why
    Define epidural collection, neural compression, disc-vertebral infection and paraspinal extension.
    Interpretation and limitations
    Image the symptomatic region urgently and extend when multifocal infection is plausible. Cultures and sepsis treatment proceed in parallel and must not delay rescue.
  4. 04
    MRI for acute epidural haematoma
    Why
    Locate blood, quantify neural compression and distinguish tumour, abscess or disc disease.
    Interpretation and limitations
    Signal changes with blood age. Progressive deficit and compression require urgent surgical assessment; no single MRI size creates a universal operative rule.
  5. 05
    CT spine or CT myelography
    Why
    Assess bone, fracture and hardware or provide an alternative when MRI cannot be performed.
    Interpretation and limitations
    Routine CT is less sensitive for epidural and neural soft tissue. CT myelography is invasive and should be selected with radiology and spinal specialists.
  6. 06
    Serial neurological examination
    Why
    Measure progression and confirm whether the imaged level explains current disability.
    Interpretation and limitations
    Timestamp segmental power, reflexes, sensation, gait and sacral findings. Any deterioration can shorten the imaging or operative timetable.
04Clinical next stepsHow the result changes management or prompts escalation.
01Worked emergency pathwayNew sacral symptoms with a low bladder residualFirst stepAn adult has new urinary-flow sensory change and saddle tingling but retains full leg power and a low residual.
  1. 1Treat the subjective sacral symptoms as positive and request emergency lumbosacral MRI; do not use the residual as a rule-out test.
  2. 2Record onset and progression, lower-limb findings and subjective perianal sensation, then aim to complete MRI within four hours of the radiology request. Use the sagittal T2 lumbosacral screening sequence; if compression is absent, obtain the cervical-and-thoracic sagittal T2 screen before concluding the imaging pathway.
  3. 3If compatible compression is present, keep nil by mouth and refer immediately to spinal surgery; route tumour, infection, haemorrhage or trauma through its additional emergency pathway.
02Malignant pathwayCancer with neurological cord dysfunctionKnown cancer is accompanied by new weakness, gait change, sensory level or sphincter dysfunction.
  1. 1Contact the MSCC coordinator immediately and arrange whole-spine MRI within 24 hours.
  2. 2Use the NG234 specialist pathway for movement, corticosteroid and surgery or radiotherapy decisions rather than importing disc-CES categories.
  3. 3DefinitiveDefine responsibility for rehabilitation and ongoing neurological monitoring after definitive treatment.
03Infective pathwayBack pain, sepsis and progressive weaknessA patient with bacteraemia develops focal spinal pain followed by a new motor deficit.
  1. 1Activate spinal surgery, infection and sepsis support while taking cultures if this will not delay treatment.
  2. 2Obtain urgent MRI without and with contrast, covering additional levels when symptoms or bloodstream infection suggest multifocal disease.
  3. 3Prioritise operative sampling during decompression when indicated and tailor antimicrobials to culture, compartment and source control.
05Risks, monitoring and follow-upComplications, safety checks and further assessment.
  • Repeat and timestamp segmental power, reflexes, sensory level, saddle sensation and bladder or bowel function while awaiting imaging and specialist decisions.
  • Monitor respiration in high cervical lesions; declining vital capacity or bulbar function can precede a fall in oxygen saturation.
  • After a negative lumbosacral CES screen, confirm that the required sagittal T2 cervical-and-thoracic screen was completed. Check cause-specific sequences and investigate non-compressive mimics without dismissing progression.
  • During selected nonoperative care, define examination frequency, repeat-imaging plan and the exact deficit or radiological change that triggers surgery.
  • Track result communication and image transfer to the receiving spinal, oncology or infection team, including who accepted responsibility.
06Special situationsVariants, exceptions and circumstances that change the usual approach.

Symptoms precede retention

Altered bladder filling or flow sensation can occur before painless retention, so questioning must go beyond asking whether the patient can pass urine.

Whole spine has a reason

Metastatic and infective disease can be multilevel or discontinuous; a single painful level may not contain the lesion driving neurology.

Cord signal supports injury

T2 hyperintensity can reflect oedema or myelomalacia, but its absence does not exclude clinically important mechanical compression.

Contrast is question-specific

Gadolinium improves assessment of infection and tumour extent, while straightforward disc-related CES usually depends on anatomical compression rather than enhancement.

Incidental stenosis is common

The report should distinguish background degenerative narrowing from the level and mechanism that actually match the neurological syndrome.

07Common pitfallsFrequent interpretation and management errors.
  1. 01

    Using a post-void residual below 200 mL or normal rectal tone to cancel emergency CES imaging.

  2. 02

    Applying the four-hour CES target to every malignant or infective spinal presentation without preserving its separate national pathway.

  3. 03

    Imaging only one spinal level in suspected metastatic compression despite the possibility of multifocal disease.

  4. 04

    Calling a routine CT negative for epidural abscess or haematoma when MRI remains feasible and clinically required.

  5. 05

    Reporting degenerative abnormalities without matching side, level and neural structure to the examination.

Practice

Two practice questions

Question 1 of 20 correct
Clinical imaging and interpretationOriginal SBA

MRI timing for malignant compression

A person with known metastatic cancer develops new leg weakness, gait difficulty and a sensory level. What is the most appropriate imaging action under the current UK MSCC pathway?

Sources and review status4 sources · checked 13 Sept 2026 · clinical review pending
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 13 Sept 2026; clinical approval remains outstanding.

  • GIRFT National Suspected Cauda Equina Syndrome PathwayMarch 2026 national pathway; pages 5–14 read for adult symptom criteria, bladder-scan limits, MRI within four hours of the radiology request and post-imaging routing. Disc-related operative categories do not transfer to tumour, infection, haemorrhage or trauma. Applied specifically to Spinal MRI and cord compression.
  • NICE NG234 spinal metastases and metastatic spinal cord compressionPublished 6 September 2023 and last reviewed 19 March 2026; recognition, immobilisation, whole-spine MRI, corticosteroid, invasive-treatment and rehabilitation recommendations read. Applies to malignant spinal disease, not disc CES or spinal infection. Applied specifically to Spinal MRI and cord compression.
  • ACR Appropriateness Criteria Suspected Spine InfectionRevised 2021; adult imaging variants for suspected spinal infection with and without neurological deficit read. US professional imaging guidance supporting MRI without and with contrast; it does not choose antibiotics or surgical timing. Applied specifically to Spinal MRI and cord compression.
  • ENLS Intracranial Hypertension and Herniation Protocol version 6.0Updated September 2024; communication, diagnosis, Tier Zero and Tier One sections read for urgent CT and imaging-confirmed obstructive hydrocephalus. Multi-aetiology consensus, not a paediatric tumour outcomes guideline. Applied specifically to Spinal MRI and cord compression.
Authoring stateComplete draftClinical stateAwaiting reviewJurisdictionUnited Kingdom