Heterotopic Ossification Mimics Neurogenic Tumor: A Case Report

Hyun-Kee Yang; Sung-Taek Jung; Ah-Reum Jo; Jae-Young Moon

doi:10.5292/jkbjts.2013.19.2.92

Journal List > J Korean Bone Joint Tumor Soc > v.19(2) > 1052037

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Yang, Jung, Jo, and Moon: Heterotopic Ossification Mimics Neurogenic Tumor: A Case Report

Case Report

J Korean Bone Joint Tumor Soc 2013;19(2):92-96.

Published online: 10 January 2013

DOI: https://doi.org/10.5292/jkbjts.2013.19.2.92

Heterotopic Ossification Mimics Neurogenic Tumor: A Case Report

Hyun-Kee Yang, Sung-Taek Jung, Ah-Reum Jo, Jae-Young Moon

Department of Orthopedic Surgery, Chonnam National University Hospital, Gwangju, Korea

Correspondence to: Jae-Young Moon Department of Orthopaedic Surgery, Chonnam National University Hospital, 42, Jebong-ro, Dong-gu, Gwangju 501-757, Korea TEL: +82-62-220-6336 FAX: +82-62-225-7794 E-mail: osjymoon@naver.com

Received 1 November 2013 Revised 23 November 2013 Accepted 25 November 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Heterotopic ossification is an abnormal bone formation after surgery or without any reason. Large joint, such as hip and knee joint, is a known most common site. Operation itself and postoperative early range of motion exercise are risk factors. We present a case of heterotopic ossification mimics neurogenic tumor after high tibial osteotomy.

Keywords: heterotopic ossification, neurogenic tumor

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Figure 1.

Plain radiograph of the right knee showing 2×2 cm sized calcified mass in the posterior knee joint (arrow).

Figure 2.

Ultrasonography on right knee. Inhomogeneous mass connected on tibial nerve.

Figure 3.

Preoperative magnetic resonance image shows 3×2.5×2 cm sized tumor arising from tibial nerve in popliteal region. (A) Axial T1weighed MR image shows inhomogeneous low signal intensity. (B) Axial T2 weighted MR image shows heterogeneous high signal intensity. (C) Axial gadolinum enhanced MR image shows heterogeneous enhanced mass.

Figure 4.

Magnetic resonance image before the high tibial osteotomy on right knee. There is no mass formation in right knee popliteal area. (A) T1 weight MR image, (B) T2 weighted MR image.

Figure 5.

Intraoperative photograph shows tumor that divided into several pieces.

Figure 6.

Hematoxylin and eosin stain of the heterotopic ossification of the right knee popliteus demonstrating osseous tissue and bone marrow formation. (A) H & E ×100, (B) H & E ×400.

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