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Hong, Ha, Sim, Kim, Lee, and Sung: Intra-articular Benign Fibrous Histiocytoma of the Knee: A Case Report
Case Report
The Journal of the Korean Bone and Joint Tumor Society

The Journal of the Korean Bone and Joint Tumor Society 2012; 18(2): 94-98.

Published online: 21 December 2012

DOI: https://doi.org/10.5292/jkbjts.2012.18.2.94

Intra-articular Benign Fibrous Histiocytoma of the Knee: A Case Report

Ki-Do Hong, Sung-Sik Ha, Jae-Cheon Sim, Tae-Ho Kim, Jong-Seong Lee, Min-Chul Sung

Department of Orthopedic Surgery, Sahmyook Medical Center, Seoul, Korea.

Correspondence to: Sung-Sik Ha. Department of Orthopedic Surgery, Sahmyook Medical Center, 29-1, Hwigyong 2-dong, Dongdaemun-gu, Seoul 130-711, Korea. TEL: +82-2-2210-3581, FAX: +82-2-2217-1897, likeapple111@naver.com

Received 4 October 2012       Revised 23 November 2012       Accepted 26 November 2012

Copyright © 2012 by The Korean Bone and Joint Tumor Society

(open-access):

"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

Benign fibrous hitiocytoma of the infrapatella fat pad is very rare. It has usually do not induced a pain or a symptom because it was located deep tissue. So it was very difficult to be diagnosed. We experienced a case of deep benign fibrous histiocytoma in a 53-year-old woman. It was diagnosed by MRI. Diagnostic arthroscopic procedure was performed and the lesion was completely resected by open excision. We report a rare case of benign fibrous hitiocytoma presenting as an intra-articular tumor in the joint causing pain and limitation of movement.

Keywords: knee, fibrous histiocytoma

Figures and Tables

Figure 1
The initial plane X-ray shows no specific sign of bone.
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Figure 2
(A) MRI of her right knee. The ovoid mass like lesion in the infrapatellar fat pad area, shows isointense on sagittal SE T1-weighted image. (B) MRI SE T2-weighted image of her right knee. This mass is relatively well defined margin and homogenous signal intensity.
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Figure 3
Arthroscopic picture of the mass presents as a single mass measuring 36×30×20 mm in diameter. It has well defined capsule, and varies in color from reddish brown to dark brown.
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Figure 4
(A) Microsopic finding of a benign fibrous histiocytoma. Characteristically most are composed of apindle cells arranged in fasicular form and round histiocyte like cells (H & E, ×200). (B) Microsopic finding of a benign fibrous histiocytoma stained by vitmentin (×400) presented positive.
jkbjts-18-94-g004

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