Hematology, Oncology & Immunology · Topic 16 of 26

Malignant Spinal Cord Compression

Hematology-oncology · oncologic emergency

Malignant Spinal Cord Compression

New back pain in a patient with cancer is cord compression until MRI of the whole spine says otherwise — dexamethasone, then surgery or radiation within 24 hours.

Key numbers

Back pain in cancer: suspect cord compressionpain first in 94%

Whole-spine MRI within 24 hourswhole-spine MRI ≤ 24 h

Give dexamethasone 10 mg IV nowdex 10 mg IV → 16 mg/day

Surgery or radiation within 24 hoursdefinitive Rx ≤ 24 h

01 · DoWhole-spine MRI within 24 hours

Order MRI of the entire spine with and without gadolinium — immediately with deficits, within 24 hours of suspicion — since up to 30% have multilevel compression; use CT myelography if MRI is contraindicated.

02 · GiveGive dexamethasone 10 mg IV now

Give dexamethasone immediately when compression causes pain or deficits: a 10–20 mg IV load (about 10 mg typical), then 16 mg/day (4 mg every 6 hours), tapered after definitive treatment.

03 · DoSurgery or radiation within 24 hours

Consult spine surgery and radiation oncology at once: definitive treatment — decompressive surgery then radiation, or radiation alone — should start within 24 hours of diagnosis, because established deficits rarely reverse.

Causes & risk factors

Why it happens

Lung, breast and prostate cause most casesLung, breast and prostate cancer cause about half of malignant cord compression; renal cell carcinoma, myeloma, lymphoma, GI cancers and melanoma cause most of the rest. With no known cancer, pursue urgent tissue diagnosis.

Presentation

What you'll see

Back pain in cancer: suspect cord compression must knowBack pain precedes weakness and was the first symptom in 94% of malignant cord compression in one series; progressive back or radicular pain, worse at night or lying flat, in cancer needs urgent evaluation.

Late signs: weakness, sensory level, retentionLater findings are leg weakness, a sensory level, hyperreflexia with extensor plantar responses, and bowel or bladder dysfunction (urinary retention, constipation); sphincter dysfunction signals a poor prognosis.

Spinal percussion tenderness over the lesionSpinal percussion tenderness is prominent when compression comes from metastatic carcinoma (or an abscess or hematoma) — examine the whole spine in every patient with cancer and back pain.

Diagnosis & monitoring

Work-up

Thoracic spine is the usual siteCompression involves the thoracic spine in about 65% of cases, the lumbosacral spine in 25% and the cervical spine in 10%; 20–35% of patients have more than one site.

Do right now

In this order

First moves

Whole-spine MRI within 24 hourswhole-spine MRI ≤ 24 h

→

Give dexamethasone 10 mg IV nowdex 10 mg IV → 16 mg/day

→

Surgery or radiation within 24 hoursdefinitive Rx ≤ 24 h

Why each step

Whole-spine MRI within 24 hoursOrder MRI of the entire spine with and without gadolinium — immediately with deficits, within 24 hours of suspicion — since up to 30% have multilevel compression; use CT myelography if MRI is contraindicated.

Give dexamethasone 10 mg IV nowGive dexamethasone immediately when compression causes pain or deficits: a 10–20 mg IV load (about 10 mg typical), then 16 mg/day (4 mg every 6 hours), tapered after definitive treatment.

Surgery or radiation within 24 hoursConsult spine surgery and radiation oncology at once: definitive treatment — decompressive surgery then radiation, or radiation alone — should start within 24 hours of diagnosis, because established deficits rarely reverse.

Management

Orders

Choose surgery for instability or radioresistant tumorsFavor surgical decompression and stabilization (then radiation) for spinal instability, a radioresistant tumor, an unknown primary needing tissue, recurrence after radiation, or worsening deficits despite treatment.

Radiation alone for radiosensitive tumorsRadiation alone is used for radiosensitive tumors — lymphoma, myeloma, small cell lung cancer, germ cell tumors — and for patients who are not surgical candidates; melanoma and renal cell carcinoma are radioresistant.

The rules

Know these

Walking at treatment start predicts outcome must knowAmbulatory status before treatment is the key predictor: 6-month survival is about 71% in patients who can walk versus about 30% in those who cannot, and complete loss of function rarely recovers.

Surgery plus radiation preserves walking betterA randomized trial stopped early because surgery followed by radiation preserved ambulation better than radiation alone; guidance refers patients with single-site compression, paraplegia under 48 hours and life expectancy over 3 months for surgery.

More detail

Reference

Show 5 reference facts

The Spinal Instability Neoplastic Score (SINS, 0–18) uses six clinical and imaging features; above 12 indicates instability, and intermediate scores (7–12, potentially unstable) also warrant a spine-surgery opinion.

The MRI-based Bilsky grade describes epidural compression: grade 2 is cord compression with CSF still visible and grade 3 is compression with no visible CSF.

For poor-prognosis patients treated with radiation alone, a single 8-Gy fraction gives ambulation similar to 5 × 4 Gy (SCORAD narrowly missed its primary non-inferiority endpoint); longer courses give more durable local control.

Taper oral dexamethasone over about 10–14 days after definitive treatment and watch glucose closely in patients with diabetes.

Prognosis depends on histology: lung cancer carries the worst survival, while breast, prostate, myeloma and lymphoma have better outcomes after cord compression.

Pearl

Treat while the patient still walks: ambulatory status at the start of treatment decides the outcome.

Sources · Merck Manual Professional — Spinal Cord Compression (2025) · Initial management and disposition of metastatic spinal cord compression in the emergency department: a review of the literature. Ann Med 2025 (summarizes ESTRO-ACROP, NICE and Dutch guidelines) · Narrative review — diagnosing and managing malignant epidural spinal cord compression: an evidence-based approach. Ann Transl Med 2023 · Multidisciplinary approach to spinal metastases and metastatic spinal cord compression — a new integrative flowchart. Cancers (Basel) 2023 (radiation-responsive vs resistant tumors, Table 2) · Starter sheet built from the verified AGACNP fact map (facts reviewed 2026-10-15).