An Intraosseous Schwannoma Combined with a Subchondral Fracture of the Femoral Head: a Case Report and Literature Review.
10.13104/imri.2017.21.3.177
- Author:
Hyun Young KIM
1
;
Kyung Nam RYU
;
Yong Koo PARK
;
Jung Soo HAN
;
Ji Seon PARK
Author Information
1. Department of Radiology, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul, Korea. t2star@naver.com
- Publication Type:Case Report
- Keywords:
Femur;
Intraosseous schwannoma;
Magnetic resonance imaging
- MeSH:
Bone Marrow;
Bone Transplantation;
Collagen;
Diagnosis;
Diagnosis, Differential;
Edema;
Femur;
Fractures, Stress;
Head*;
Hip;
Magnetic Resonance Imaging;
Nerve Sheath Neoplasms;
Neurilemmoma*
- From:Investigative Magnetic Resonance Imaging
2017;21(3):177-182
- CountryRepublic of Korea
- Language:English
-
Abstract:
Schwannomas are benign nerve sheath tumors that are typically located in soft tissue. Occasionally, schwannomas involve osseous structures. These intraosseous schwannomas are generally benign neoplasms that account for less than 0.2% of primary bone tumors. Schwannomas are very rarely observed in long bones. We present a case of a schwannoma affecting the proximal femur with a coincident subchondral fracture of the femoral head. A 38-year-old-male presented with left hip pain without deteriorating locomotor function. Plain film radiographs displayed a lobulating contoured lesion within the intertrochanteric portion of the femur. The magnetic resonance imaging (MRI) scans showed a tumor occupying the intertrochanteric region. Diffuse bone marrow edema, especially in the subchondral and head portions of the femur that was possibly due to the subchondral insufficiency fracture was also noted. The lesion was surgically excised and bone grafting was performed. Histologically, there was diffuse infiltrative growth of the elongated, wavy, and tapered cells with collagen fibers, which are findings that are characteristic of intraosseous schwannoma. Although very rare, intraosseous schwannoma should be included in the differential diagnosis of radiographically benign-appearing, non-aggressive lesions arising in the femur. The concomitant subchondral fracture of the femoral head confounded the correct diagnosis of intraosseous schwannoma in this case.
