J Korean Foot Ankle Soc.  2019 Jun;23(2):74-77. 10.14193/jkfas.2019.23.2.74.

Fibroma of the Extensor Digitorum Longus and Extensor Digitorum Brevis Conjoined Tendon Sheath: A Case Report

  • 1Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea. qortn97@naver.com
  • 2Department of Orthopaedic Surgery, Konkuk University Chungju Hospital, Konkuk University College of Medicine, Chungju, Korea.


Fibroma of the tendon sheath (FTS) was initially described in 1936 by Geschickter and Copeland as a benign firmed soft tissue tumor that is rare and less common than another soft tissue tumors, especially giant cell tumors (GCT) of the tendon sheath. The common distinct feature is a slow-growing least painful rare entity arising from the tendon or tendon sheath. FTS is detected mostly in the fingers, hands and wrists but less commonly in the foot. Very few cases of FTS have been described arising from a flexor tendon of the foot. This article describes a 51-year-old patient with FTS that developed in the extensor tendon of the foot, which is the only known FTS to form in this area. Heterogeneous low signal intensity in both the T1- and T2-weighted images was observed in magnetic resonance imaging. The lesion was excised completely by open surgery. Histologically, it showed randomly arranged, fibroblast-like spindle cells in dense fibrous tissue and had insufficient hemosiderin-laden macrophages that are typical for GCT.


Fibroma; Foot
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