J Korean Foot Ankle Soc.  2014 Dec;18(4):212-216. 10.14193/jkfas.2014.18.4.212.

Large Forefoot Schwannoma: A Case Report

• Seo ES
• Lee JH
• Jeon SH

• KMID: 2181644
• DOI: http://doi.org/10.14193/jkfas.2014.18.4.212

Abstract

A schwannoma is a benign neurogenic tumor derived from Schwann cells. A rare case of a large painful schwannoma in the foot with metatarsal deformity was presented. Due to suspicion of malignancy, amputation had been recommended previously. We report on a rare case of a large forefoot schwannoma causing pain and paresthesia of the forefoot.

Keyword

Forefoot; Schwannoma; Mass excision

MeSH Terms

Amputation
Foot
Foot Deformities
Neurilemmoma*
Paresthesia
Schwann Cells

Figure

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  Figure 1. Anteroposterior radiograph shows lateral angulation and sclerosis of second, third metatarsal shaft.

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  Figure 2. The axial T2-weighted magnetic resonance image shows a heterogenous cystic mass with low to hyperdense signal intensity, with dorsal and plantar extension.

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  Figure 3. (A) A excised mass was removed through plantar incision. (B) Clinical photograph after mass excision shows both a deep peroneal nerve and a common proper digital nerve derived from medial plantar nerve.

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  Figure 4. (A) Gross photograph shows a well circumscribed and encapsulated mass. (B) The cross section of mass appears diffusely myxoid and grayish yellow cut surfaces without hemorrhage or necrosis.

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  Figure 5. (A) Histological features show a characteristic biphasic pattern of Antoni A and Antoni B of neurogenic spindle cell proliferation (H&E stain, ×100). (B) Immunostaining for the S-100 protein was strong and diffuse confirming the diagnosis of schwannoma (×100).

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  Figure 6. Anteroposterior radiograph shows a remodeling of second, third metatarsal shaft six month later.

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