Spinal Cord Tumor Resection

What it is

Spinal cord tumor resection is the microsurgical removal of a tumor that involves the spinal cord or the coverings around it. These operations are grouped by where the tumor sits relative to two structures: the dura, which is the tough sac enclosing the cord, and the cord itself.

Intradural extramedullary tumors sit inside the dura but outside the spinal cord. Schwannomas, which arise from the insulating cells of a nerve root, and meningiomas, which arise from the lining of the dura, make up the majority. These lesions displace the cord rather than invade it, which usually means there is a surgical plane to work along.

Intramedullary tumors arise within the substance of the cord. Ependymomas typically have a definable margin against normal cord tissue. Astrocytomas often blend into it. Hemangioblastomas are highly vascular and are sometimes associated with von Hippel-Lindau disease. The quality of that margin, more than the size of the tumor, governs how much can be removed safely.

Extradural tumors sit outside the dura entirely and most often represent spread from a cancer elsewhere in the body. Those are addressed in spinal metastasis surgery, which follows a different logic.

Who it helps

Surgery is considered for patients with a spinal tumor causing neurological symptoms, a tumor with documented growth on serial imaging, or a lesion whose identity is uncertain and cannot be established without tissue. Common presentations include:

• Progressive weakness, clumsiness, or difficulty walking
• Numbness, tingling, or burning that follows a nerve or spreads below a level on the trunk
• Back or neck pain that is worse at night or wakes you from sleep, a pattern that differs from mechanical pain
• Changes in bladder or bowel control
• A tumor found incidentally that is enlarging on follow-up imaging

Not every spinal tumor requires an operation. A small, stable, asymptomatic lesion may be watched with interval imaging, and that is a legitimate plan rather than a delay in care. Some presentations, however, should not wait for a scheduled appointment.

How it's performed

The operation is done under general anesthesia with continuous intraoperative neurophysiological monitoring running from before the first incision until closure.

Exposure. The tumor is reached from behind through a laminectomy, in which the bony arch over the canal is removed, or a laminoplasty, in which that bone is lifted as a unit and replaced at the end. The exposure is kept to the minimum length that allows the tumor to be seen from one pole to the other. Intraoperative ultrasound is used before opening the dura to confirm the tumor is centred within the exposure.

Opening the dura. The dura is opened in the midline under the operating microscope and held back with fine sutures. From this point the operation is entirely microsurgical.

Extramedullary tumors. The lesion is separated from the cord and nerve roots along its natural plane. Larger tumors are debulked from the inside first so the capsule can be collapsed inward, away from the cord, rather than pulled across it. For a schwannoma the nerve fascicle of origin is identified and, where possible, the remaining functional fascicles are preserved. For a meningioma the dural attachment is addressed to reduce the chance of regrowth.

Intramedullary tumors. The cord is entered through a midline myelotomy, an opening made along the anatomical seam where the two halves of the cord meet. The tumor is removed from within using microdissection and an ultrasonic aspirator, working outward toward the margin. Where a clear plane exists, dissection follows it. Where the tumor infiltrates cord tissue with no border, the resection stops. Neuromonitoring signals guide that decision continuously.

Closure and stabilization. The dura is closed watertight to prevent a cerebrospinal fluid leak. If the bony removal or the tumor itself has compromised the structural integrity of the spine, instrumentation is placed during the same operation.

Recovery

Most patients spend several days in the hospital. The first day or two typically involves lying relatively flat if the dura was opened, which allows the closure to seal and reduces the risk of a spinal fluid leak. Mobilization begins after that and progresses with physical therapy.

Neurological recovery follows its own timeline and is not the same as wound healing. A deficit that was present before surgery may improve over weeks to months as the cord recovers from compression, and some deficits do not fully resolve. It is also common for intramedullary surgery to produce a temporary worsening of position sense or coordination in the early postoperative period, which then improves. Knowing this in advance makes the first few weeks considerably less alarming.

Follow-up imaging is obtained at intervals to document the extent of resection and to watch for recurrence. For tumors where pathology indicates a role for radiation or systemic therapy, care continues jointly with radiation and medical oncology.

Risks & considerations

Any operation involving the spinal cord carries real risk, and these should be understood specifically rather than in general terms.

• Neurological injury. Weakness, numbness, altered coordination, or changes in bladder, bowel, or sexual function. The risk is meaningfully higher for intramedullary tumors than for extramedullary ones, because the working plane is inside the cord.
• Cerebrospinal fluid leak. The dura is opened deliberately in these operations, so leak and pseudomeningocele are recognized complications and occasionally require a second procedure to repair.
• Incomplete resection and recurrence. Where the margin is infiltrative, residual tumor is left on purpose to preserve function. Residual or recurrent tumor may require surveillance, radiation, or further surgery.
• Spinal instability or deformity. Removing bone to reach the tumor can destabilize the spine, particularly over multiple levels or in the cervical region, which is why instrumentation is sometimes part of the plan from the outset.
• Infection, bleeding, and anesthetic risk, as with any major spinal operation.

The central trade-off in this surgery is between the completeness of removal and the preservation of function. That trade should be discussed and agreed on before the operation, not improvised during it.