Intraosseous neurilemmoma of the fibula

Abstract

We present a case of intraosseous neurilemmoma of the fibula in a 56-year-old woman. The case showed the typical radiographic appearance except for the presence of spotted calcifications that mimicked a cartilaginous tumor. Enhanced MR images revealed the heterogeneity of the tumor, which consisted of Antoni type A and B tissue.

Intraosseous Schwannoma of the Second Metacarpal: Case Report

“…14 The x-ray features of intraosseous schwannoma include a well-defined lytic lesion, scelerotic margins, lobulated or trabeculated contour, cortical expansion and erosion, and absence of central calcification. 4,15,16 However, the x-ray findings are nonspecific. 1,6,16 The MRI appearance of the tumor tends to be isointense to skeletal muscles on T1-weighted images and markedly hyperintense to fat on T2-weighted images.…”

“…4,15,16 However, the x-ray findings are nonspecific. 1,6,16 The MRI appearance of the tumor tends to be isointense to skeletal muscles on T1-weighted images and markedly hyperintense to fat on T2-weighted images. 4,16,17 Although most schwannomas contain both Antoni A and Antoni B arrangements, further subclassification of these lesions by predominate tissue has been considered.…”

Association between intraosseous schwannoma occurrence and the position of the intraosseous nutrient vessel: A case report

“…Therefore, an intraosseous schwannoma involving a long bone may be associated with the second mechanism, the tumor arises and develops within the nutrient canal, and related to the site of the nutrient artery; however, the most common location of intraosseous schwannomas in long bones remains to be elucidated. A total of 4 cases of intraosseous schwannoma of the fibula were previously reported with clear radiographic figures (4)(5)(6), and 3 of these cases occurred in the diaphysis of the fibula. As free vascularized fibular grafts have been widely used to cover skeletal bone defects larger than 6 cm (16), it has been reported that the nutrient canal into the fibula is positioned between 12 and 18 cm from the tip of the fibula, in the diaphysis (17).…”

“…Fewer than 200 cases have been previously reported; of these cases, the most common sites of the involved bones were the mandible and sacrum (2). Although a number of cases of intraosseous schwannoma involving the long bones have been previously reported (3)(4)(5)(6)(7)(8), this type of disease is relatively rare, and the typical location at which an intraosseous schwannoma of the long bones may arise is uncertain. Intraosseous schwannoma presents as a slowly enlarging and painless mass (8); however, if the bone becomes affected and a microfracture is caused, the mass becomes painful.…”

Schwannoma of T12 Vertebra: Case Report and Review of Literature

“…Although it can appear in any age, the usual age group is the third or fourth decade.There appears no predilection for sex. 2 They have been reported to arise in mandible 3 (most common), sacrum, 4 lumbar, 5 thoracic 6,7 and cervical vertebrae, 8,9 femur, 10 tibia, ® bula, 2 sternum, 11 calcaneum, 12 etc. The reason for the increased incidence in mandible is due to either the long intra-osseous course of the nerve or the increased predilection of schwanomas to the head and neck region, which has a large supply of sensory nerves.…”