Intraosseous Schwannoma: Case Report and Review of the Literature^[*]

Abstract

Schwannoma is a benign neural sheath tumor of the soft tissue, and its intraosseous presentation is very rare. It is estimated that intraosseous schwannomas represent 0.2% of all bone tumors. The tumor may affect any site of the skeleton, including the mandible, the sacrum, vertebral bodies, the ulna, the humerus, the femur, the tibia, the patella, the scapula, the ribs, and small bones of the hand. The involvement of the calcaneus has only been reported four times in the literature. The present study reports the case of a 49-year-old male with right hindfoot pain and a radiological finding of an osteolytic bone lesion in the calcaneus. The diagnosis was confirmed by histopathological study. The treatment of choice was an intralesional resection with adjuvant local control, and bone defect substitution with polymethylmethacrylate and fixation with two cannulated screws. The patient had a satisfactory postoperative evolution; after 1 year, he is asymptomatic, with good functional response and no evidence of disease. The present case report shows the clinical, radiological, and pathological features of a rare benign bone neoplasm. Moreover, intraosseous schwannoma should be included in the differential diagnosis of osteolytic calcaneal lesions.

Keywords

bone neoplasms - neurilemmoma - calcaneus

^* Originally Published by Elsevier Editora Ltda.

• Referências

• 1 de la Monte SM, Dorfman HD, Chandra R, Malawer M. Intraosseous schwannoma: histologic features, ultrastructure, and review of the literature. Hum Pathol 1984; 15 (06) 551-558
• 2 Kashima TG, Gibbons MR, Whitwell D. , et al. Intraosseous schwannoma in schwannomatosis. Skeletal Radiol 2013; 42 (12) 1665-1671
• 3 Ida CM, Scheithauer BW, Yapicier O. , et al. Primary schwannoma of the bone: a clinicopathologic and radiologic study of 17 cases. Am J Surg Pathol 2011; 35 (07) 989-997
• 4 Sochart DH. Intraosseous schwannoma of calcaneum. Foot 1995; 5: 38-40
• 5 Wirth WA, Bray Jr CB. Intra-osseous neurilemoma. Case report and review of thirty-one cases from the literature. J Bone Joint Surg Am 1977; 59 (02) 252-255
• 6 Knight DM, Birch R, Pringle J. Benign solitary schwannomas: a review of 234 cases. J Bone Joint Surg Br 2007; 89 (03) 382-387
• 7 Antonescu CR, Perry AA, Woodruff JM. Schwannoma (including variants). In: Fletcher CD, Bridge JA, Hogendoorn P, Mertens F. , editors. WHO Classication of Tumours of Soft Tissue and Bone. 4 th ed. Lyon: IARC Press; 2013: 170-172
• 8 Pyati PS, Sanzone AG. Intraosseous neurilemoma of the calcaneus. Orthopedics 1996; 19 (04) 353-355
• 9 Li K, Yang Q, Gao B. , et al. Giant intraosseous Schwannoma of the calcaneus: case report. Int J Clin Exp Med 2016; 9 (03) 6897-6901
• 10 Salunkhe R, Limaye S, Biswas SK, Mehta RP. A rare case of calcaneal intraosseous schwannoma. Med J DY Patil Univ 2012; 5: 76-78