J Korean Orthop Assoc.  2015 Dec;50(6):532-535. 10.4055/jkoa.2015.50.6.532.

Ulnar Neuropathy Caused by a Schwannoma in the Guyon's Cannal

• Lee SM
• Park SY
• Park MS

• KMID: 2185095
• DOI: http://doi.org/10.4055/jkoa.2015.50.6.532

Abstract

Guyon's canal syndrome is a compression neuropathy of the ulnar nerve entrapment at the wrist. Compression of the ulnar nerve at the wrist by a ganglion, lipomas, diseases of the ulnar artery, fractures of the hamate and trauma is a common etiological factor. We report on a rare case of ulnar neuropathy caused by a schwannoma at the level of Guyon's canal.

Keyword

schwannoma; ulnar nerve; neuropathy; Guyon's canal

MeSH Terms

Ganglion Cysts
Lipoma
Neurilemmoma*
Ulnar Artery
Ulnar Nerve
Ulnar Nerve Compression Syndromes
Ulnar Neuropathies*
Wrist

Figure

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  Figure 1 A about 2.2×1.4 cm sized homogeneous mass in Guyon's canal over the anterior portion of left pisiform is seen.

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  Figure 2 A well capsulated yellowish colored mass, 1.7×1.0 cm in size inside the epineurium of the ulnar nerve is identified when nerve sheath was incised, and the mass was enucleated.

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  Figure 3 (A) Excised specimen was a yellowish round rubbery mass, measuring 2.2×1.5×0.8 cm. (B) The tumor is composed of spindle cells with wavy appearing nuclei (H&E, ×100). The mass is strongly positive with S100 protein. (C) There were more celluar "Antoni A" pattern with looser stroma and fewer cells "Antoni B" pattern (H&E, ×200).

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