Malignant spinal cord compression: workup and management
New back pain in a patient with cancer is spinal metastasis until proven otherwise. Neurological deficits, bladder or bowel dysfunction, or saddle anesthesia mean possible cord or cauda equina compression: start dexamethasone, get an MRI of the whole spine within 24 hours (immediately if deficits), and involve spine surgery and radiation oncology.
Working diagnosis
Adult · US guidelines
Draft · awaiting physician review
01Orient
What's new in the evidence
- ASTRO 2024 bone metastases guideline: dexamethasone 10 mg IV bolus, then 4–6 mg every 6–8 hours (or 8 mg every 12 hours); taper quickly after definitive treatment
- Very high-dose dexamethasone (96 mg) adds toxicity without clear benefit
- Surgery then radiotherapy (Patchell) for selected solid tumors with good prognosis; SBRT increasingly used after decompression
Differential diagnoses
- Metastatic epidural spinal cord compression (can't miss)
- Cauda equina syndrome from disc herniation (can't miss)
- Spinal epidural abscess (can't miss: fever, injection drug use)
- Vertebral compression fracture
- Spinal epidural hematoma (anticoagulation)
- Mechanical back pain, radiculopathy
02Assess
Risk scores and decision tools
- Epidural spinal cord compression (Bilsky) grade on MRI
- Spinal Instability Neoplastic Score (SINS)
- Performance status and estimated prognosis to choose surgery vs radiotherapy
Key history questions
- Cancer history (breast, lung, prostate, kidney, myeloma, lymphoma)
- Pain character: worse lying flat, at night, with cough or strain
- Leg weakness, numbness, unsteady gait
- Urinary retention or incontinence, constipation, saddle numbness
- Fever, injection drug use, anticoagulation
Examination findings
- Spinal tenderness
- Motor power, tone, reflexes, plantar responses
- Sensory level; saddle sensation
- Post-void residual (retention); rectal tone if indicated
03Investigate
Initial investigations
- MRI of the whole spine with and without contrast (CT myelogram if MRI is contraindicated)
- CBC, BMP, calcium, coagulation
- Bladder scan
Advanced investigations
- Tissue diagnosis if no known primary
- Staging imaging
04Treat
Immediate management
- Dexamethasone 10 mg IV, then 4–6 mg every 6–8 hours (or 8 mg every 12 hours) when compression is suspected
- Flat bed rest with spinal precautions if pain or instability
- Urgent spine surgery and radiation oncology consults
First-line treatment
- Decompressive surgery followed by radiotherapy in selected patients with good performance status and single-level compression
- Radiotherapy alone for others
- Analgesia, bowel and bladder care, VTE prophylaxis
Second-line treatment
- Spinal epidural abscess: emergency surgery and IV antibiotics
- Chemotherapy for highly chemosensitive tumors (e.g., lymphoma) with oncology
Specialist referrals
- Spine surgery (neurosurgery or orthopedics)
- Radiation oncology and medical oncology
- Physical therapy and rehabilitation; palliative care
05Disposition
Admission criteria
- Suspected or confirmed compression with any neurological deficit
Safe discharge criteria
- Not applicable while compression is suspected
Follow-up timing
- Oncology follow-up after definitive treatment
Patient instructions
- Report new weakness, numbness or bladder or bowel changes immediately
Monitoring
- Neuro checks every 4 hours
- Glucose on dexamethasone
Clinical pearls and pitfalls
- Ambulatory status at diagnosis is the strongest predictor of walking after treatment
- Do not wait for neurological signs to image a cancer patient with new back pain
RefGuidelines and landmark evidence
For education only. Typical adult starting points; confirm doses against renal function, allergies, interactions and your institution's protocols. Not a substitute for clinical judgment or senior review.