Extradural Spinal Tumors: Metastases, Myeloma & Primary Bone Tumors

Spinal Tumors · Reviewed by Lekhaj Daggubati, MD

Extradural tumors grow in the bones of the spine or the space around the dura, outside the membrane that holds the spinal cord. The great majority are metastases — cancer that has spread from the breast, lung, prostate, kidney, thyroid or elsewhere — and multiple myeloma. Primary tumors of the vertebrae themselves (chordoma, chondrosarcoma, osteosarcoma, giant cell tumor, aneurysmal bone cyst, osteoid osteoma, hemangioma) are much rarer.

The goals of treatment are different from intradural tumors: relieve pain, protect the spinal cord, keep the spine stable, and get the patient back to systemic cancer treatment quickly. Surgery is one tool among several, and today most extradural tumors are treated with focused radiation, with surgery reserved for cord compression or instability. Dr. Daggubati works within a multidisciplinary team with medical and radiation oncology, and uses minimally invasive stabilization whenever the anatomy allows.

Symptoms

Back or neck pain that is new, constant, and worse at night
Pain that does not change with position (unlike mechanical back pain)
Pain with standing or walking that eases lying down (a sign of instability)
Weakness, numbness or stiffness in the legs
Difficulty walking
Loss of bladder or bowel control — an emergency

How it is diagnosed

MRI of the whole spine with contrast shows the tumor and how close it is to the spinal cord. CT shows bone destruction and is used to judge stability. PET or body imaging stages the cancer. A biopsy is needed when no cancer diagnosis exists or when the tumor may be a primary bone tumor, which is treated very differently.

When to seek urgent care

A patient with known cancer who develops new weakness, numbness, difficulty walking, or bladder or bowel change needs same-day evaluation and imaging. Spinal cord compression from a tumor is treatable, but the outcome depends on how quickly it is relieved.

Treatment options

Without surgery

Radiation — conventional or stereotactic radiosurgery (SBRT) — is the main treatment for most spinal metastases and controls pain and tumor growth in the majority. Steroids reduce swelling around the cord. Systemic therapy continues. A brace may be used for pain from a stable fracture.

Surgical options Dr. Daggubati offers

How the decision is made

Three questions guide treatment of a spinal metastasis, and each has a validated framework behind it:

Is the cord compressed? The ESCC grade (epidural spinal cord compression, 0–3) on MRI. Low grades are treated with radiation alone; high grades with cord deformity usually need surgical decompression first, because radiation cannot shrink the tumor fast enough.
Is the spine stable? The SINS score (Spinal Instability Neoplastic Score, 0–18) combines location, pain with movement, bone destruction, alignment, vertebral collapse and involvement of the posterior elements. Scores of 13 and above indicate instability that needs stabilization regardless of radiation.
What does the whole picture support? Tumor type and its sensitivity to radiation, the extent of disease elsewhere, and the patient’s condition and goals. Surgery is offered when it will meaningfully protect function or relieve pain in someone well enough to benefit.

Separation surgery

Modern surgery for metastases rarely tries to remove the whole tumor. Instead, separation surgery removes the part of the tumor pressing on the spinal cord, creating a small margin of space, and stabilizes the spine with screws — often placed through the skin with navigation. Stereotactic radiosurgery then treats the rest of the tumor with high precision a few weeks later. This combination controls the tumor in most patients with far less surgery than older approaches, and allows a faster return to chemotherapy or immunotherapy.

Primary bone tumors

Chordoma, chondrosarcoma and other primary tumors of the vertebrae are treated differently from metastases: the goal is complete removal with a margin (en bloc resection), because these tumors respond poorly to radiation and recur if cut through. This is planned surgery, often staged, with reconstruction of the spine. Benign lesions such as hemangiomas are usually watched; osteoid osteomas and aneurysmal bone cysts are treated when painful, sometimes with ablation or embolization rather than open surgery.

What to expect

Radiosurgery alone: outpatient, one to five sessions; pain relief over days to weeks.
Kyphoplasty: same-day; often immediate relief of fracture pain.
Percutaneous stabilization: one to three nights; walking the next day; systemic therapy typically resumes within two to three weeks.
Separation surgery with stabilization: three to five nights; walking within one to two days; radiosurgery two to four weeks later; systemic therapy resumes when the wound has healed.

Common questions

My oncologist found a spot on my spine. Do I need surgery?

Most spinal metastases do not need surgery. Radiation and systemic treatment control the majority. Surgery is for cord compression, instability, or a fracture causing uncontrolled pain — and even then, the minimally invasive options are often enough.

How fast does this need to be treated?

Pain alone can be evaluated within days. New weakness or numbness is urgent — the same day — because function recovers best when the cord is decompressed early.

Will surgery delay my cancer treatment?

Briefly. Minimally invasive stabilization delays systemic therapy by about two to three weeks; open decompression by three to four. This is planned with your oncologist so the overall course of treatment is not compromised.

Not sure this is you?

Bring your imaging and your story. A single visit usually clarifies what is going on and which options are realistic. Request an appointment or call (301) 718-9611.