Peripheral Nerve Tumor Surgery

Not always. A schwannoma is often removed when it causes symptoms such as pain, numbness, or weakness, or when it is growing on imaging. A small schwannoma that causes no symptoms and is stable can often be watched with periodic MRI instead. The decision weighs the benefit of removing the tumor against the risk to the nerve, and it differs from patient to patient.

Often, for schwannomas. A schwannoma usually grows from a single fascicle inside a capsule, which lets the surgeon separate it from the working nerve fibers and remove it while preserving function. Neurofibromas are harder because they grow within the fibers themselves. Intraoperative nerve monitoring helps protect functional fibers during surgery, though no operation on a nerve is without risk.

Many schwannomas grow slowly and can be safely monitored for years with periodic imaging. Left alone, some stay stable while others slowly enlarge and may eventually press on the nerve, causing pain, numbness, or weakness. A tumor that grows, becomes painful, or changes in character is reevaluated. Watching a stable, symptom-free tumor is a reasonable approach for many people.

Recovery depends on the tumor's size and location. After removal of a smaller benign tumor, many people go home the same day or within a day and return to light activity over days to a few weeks. Temporary numbness or altered sensation in the area the nerve supplies is common and often improves over weeks to months. Larger tumors usually involve a longer recovery.

Often not, for a typical-appearing benign tumor. Schwannomas have a characteristic look on MRI, and a needle in a nerve carries its own risk of pain or injury, so the diagnosis is frequently confirmed from the tissue removed at surgery rather than from a biopsy beforehand. A biopsy is usually done first when imaging is atypical or a malignant tumor is suspected.

Most peripheral nerve tumor surgery is done under general anesthesia, so the patient is asleep and feels nothing during the operation. The anesthesia plan is chosen to allow accurate nerve monitoring, which the surgical team uses to identify and protect working nerve fibers while the tumor is removed.

Many smaller benign tumors are removed on a same-day or short-stay basis, and the patient goes home the day of surgery or after one night. Larger tumors, tumors in complex locations, and malignant tumors usually require a hospital stay. Whether a specific surgery is outpatient depends on the tumor and the patient.

For a malignant peripheral nerve sheath tumor, the goal is not to spare the nerve but to remove the tumor widely, with a margin of healthy tissue, to achieve clear edges. This is usually combined with radiation and sometimes chemotherapy, and it is planned by a multidisciplinary team. The approach is closer to sarcoma surgery than to benign nerve tumor removal.

A benign schwannoma that is completely removed has a low chance of returning. Neurofibromas and tumors that cannot be fully removed carry a higher chance of recurrence. Patients with genetic conditions such as NF1, NF2, or schwannomatosis can develop new, separate tumors over time and are monitored long term. Follow-up imaging is used when there is reason to watch for recurrence.