Tarsal Tunnel Syndrome Secondary to Schwannoma of the Posterior Tibial Nerve |
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| Institution: | 1. Second Year Resident, Beth Israel Deaconess Medical Center, Boston, MA;2. Third Year Resident, Beth Israel Deaconess Medical Center, Boston, MA;3. Second Year Resident, Department of Pathology, Beth Israel Deaconess Medical Center, Boston, MA;4. Dermatopathologist, Department of Pathology, Beth Israel Deaconess Medical Center, Boston, MA;5. Chief, Division of Podiatric Surgery, Department of Surgery, Beth Israel Deaconess Medical Center, Boston, MA;1. Winona Health Podiatry, Winona, Minnesota, U.S.A.;2. Department of Orthopaedics, Podiatry & Sports Medicine, Gundersen Health System, La Crosse, Wisconsin, U.S.A.;1. Department of Orthopaedic Surgery, Hokkaido Saiseikai Otaru Hospital, Otaru, Japan10-1, Chikko, Otaru-shi, Hokkaido, 047-0008, Japan;2. Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, S-1, W-16, Chuo-ku, Sapporo, 060-8543, Hokkaido, Japan;1. Assistant Professor, Division of Orthopaedic Surgery, Department of Surgery, University of Alabama, Birmingham, School of Medicine, Birmingham, AL;2. Postgraduate Year 4, Division of Orthopaedic Surgery, Department of Surgery, University of Alabama, Birmingham, School of Medicine, Birmingham, AL;3. Surgeon, Division of Orthopaedic Surgery, Department of Surgery, University of Alabama, Birmingham, School of Medicine, Birmingham, AL |
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| Abstract: | Schwannoma is a benign tumor that arises from the peripheral nerve sheath. It presents as a discrete, often tender, and palpable nodule associated with neurogenic pain or paresthesia when compressed or traumatized. The growth rate is usually slow, and these lesions seldom exceed 2 cm in diameter. We report the case of a large schwannoma arising from the posterior tibial nerve located in the posterior medial ankle. The core needle biopsy findings were suggestive of a schwannoma, with spindle cells strongly and uniformly immunostaining for S-100 protein. The mass was marginally excised. The surgical specimen consisted of a grossly encapsulated white-yellow mass with irregular contours, measuring 3.7 × 3.5 × 2.7 cm. The cut surface showed areas of pin-point hemorrhage. The patient did not encounter any motor deficits; however, early results showed some subjective numbness. Few reports have been published of schwannomas arising from the tibial nerve. Marginal excision appears to be the recommended therapy for this tumor, without any evidence of recurrence at 9 months of follow-up. |
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