Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Township, MI
Last reviewed: May 2026
| Tumor Type | Origin | Malignant? | Key Features |
|---|---|---|---|
| Schwannoma (neurilemmoma) | Schwann cells of peripheral nerve sheath | Rarely (<1%) | Encapsulated; eccentric on nerve; displaceable; well-defined on MRI; most common benign nerve tumor |
| Neurofibroma | All nerve sheath components | Low risk in isolated; higher in NF1 (plexiform) | Not encapsulated; infiltrates nerve; cannot displace from nerve; associated with NF1 if multiple |
| Malignant peripheral nerve sheath tumor (MPNST) | Peripheral nerve; often prior neurofibroma | Yes — aggressive sarcoma | Rapid growth; pain at rest; nerve deficit; size >5cm; NF1 association; urgent evaluation |
| Intraneural perineurioma | Perineurial cells | No | Rare; fascicular involvement; weakness more than pain; young patients |
| Feature | Benign Nerve Tumor (Schwannoma) | Malignant Nerve Tumor (MPNST) |
|---|---|---|
| Growth rate | Slow — months to years | Rapid — weeks to months |
| Pain at rest | Usually absent; pain with pressure/percussion only | Present — rest pain and night pain are red flags |
| Neurologic deficit | Rarely (with large tumors) | Common — weakness, numbness, foot drop |
| Size | Usually <3–4cm | Often >5cm at diagnosis |
| MRI appearance | Well-defined; encapsulated; “target sign” on T2 | Irregular margins; heterogeneous; central necrosis |
| NF1 association | Uncommon | Common — 50% of MPNSTs arise in NF1 patients |
| Treatment | Observation or elective excision | Wide surgical excision + adjuvant therapy urgently |
Quick answer: Nerve Sheath Tumor Foot is a common foot/ankle topic that affects many patients. The 2026 evidence-based approach combines proper diagnosis, conservative-first treatment, and escalation only when needed. We treat this regularly at our Howell and Bloomfield Township practices. Call (810) 206-1402.
Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatrist | Balance Foot & Ankle, Michigan | 5,000+ patients/year
The most important clinical decision with Nerve Sheath Tumor Foot isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
The most important clinical decision with Nerve Sheath Tumor Foot isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Types of Nerve Sheath Tumors
Schwannoma (neurilemmoma): Benign, encapsulated tumor arising from Schwann cells. Can occur on any peripheral nerve, including the tibial, sural, and plantar nerves. Has an eccentric relationship to the parent nerve — the nerve fibers push around the tumor capsule rather than running through it — allowing complete enucleation with nerve preservation. Neurofibroma: Less encapsulated than schwannoma, nerve fibers run through the tumor. Solitary neurofibromas are usually benign; multiple neurofibromas suggest neurofibromatosis type 1 (NF1) and have a higher transformation risk to malignant peripheral nerve sheath tumor (MPNST).
Clinical Features
A nerve sheath tumor characteristically presents with: a palpable mass along the course of a nerve, a positive Tinel’s sign (percussion of the mass radiates electric sensations into the nerve’s distribution), and symptoms that may include weakness, numbness, or pain depending on the involved nerve. Symptoms are often worse with direct pressure.
Diagnosis
MRI is the definitive imaging — schwannomas show a characteristic “target sign” on T2 weighted images (central low signal surrounded by high signal). The lesion’s relationship to the parent nerve, its MRI signal characteristics, and the patient’s history of NF1 all guide management. Ultrasound can also visualize these masses and their nerve relationships in experienced hands.
Treatment
Schwannomas: surgical enucleation from the nerve capsule (marginal excision) is curative in >95% of cases with nerve preservation in >80%. Neurofibromas: more complex dissection given intrafascicular growth — complete removal often requires sacrificing the parent nerve fascicles. Malignant transformation (MPNST) requires wide excision similar to other sarcomas.
FAQs
If I have a painful bump along a nerve in my foot with tingling when pressed — is this a nerve tumor? A Tinel’s sign at a mass in the foot is characteristic of a nerve sheath tumor. MRI evaluation is the appropriate next step before any treatment decision.
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In-Office Treatment at Balance Foot & Ankle
If home treatment isn’t providing relief for your foot mass or growth, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.
Same-day appointments available. (810) 206-1402
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Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.