Case report 734

Abstract

A case is presented of a 37-year-old man with an extrinsic lesion originating in the soft tissue adjacent to the 3rd metatarsal and smoothly eroding the adjacent bone. The operatively confirmed diagnosis of fibroma of tendon sheath was surprising, giant cell tumour of tendon sheath eroding bone being considerably more common; these two lesions are normally impossible to distinguish radiologically.

An intraarticular fibroma of the tendon sheath in the knee joint

“…Occasionally, cell type could be myofibroblast as described by Hashimoto, which was observed in this case [8]. Fibroblastic proliferation distinguishes it from the GCTTS [13]. Other histological features of the GCTTS are multinucleated giant cells, foamy histiocytes, and hemosiderin‐laden xanthoma cells [18].…”

“…It can occur at any age with a peak incidence at 20–50 years with slight male predominance [4, 16]. Plain X‐rays are usually normal, except when large tumor mass compresses surrounding muscles or fat, or there are erosive bony changes, which is very rare [4, 13].…”

Fibroma of the tendon sheath in the dorsum of the foot: A case report

“…When we searched PubMed, Scopus, and Ichushi web (a database of Japanese medical literature) with the search terms ”fibroma of tendon sheath” AND ”foot” OR ”back/dorsum of the foot” OR ”extensor digitorum brevis muscle”, we only found seven cases. 3 , 4 , 5 , 6 , 7 , 8 , 9 Notably, four of the cases were in Japan, one in the United States, one in the United Kingdom, and one in India. We speculate that the more frequent reportage in Japan may reflect greater rates of trauma to the dorsum of the foot.…”

“… 2 FTS of the dorsum of the foot is particularly rare: to our knowledge, only seven cases have been reported to date. 3 , 4 , 5 , 6 , 7 , 8 , 9 We report here a case of huge FTS that arose from the extensor digitorum brevis tendon in the dorsum of the foot and grew relatively rapidly.…”

A Rare Bone Erosion due to Fibroma of the Tendon Sheath

“…It must be resected as the entire tumor including all tumor lobules to prevent local recurrence. Differential diagnoses of tumors accompanied with bone lesions include GCTTS, hemangioma, lipoma, schwannoma, glomus tumor, synovial chondromatosis, fibrosarcoma, rhabdomyosarcoma, clear cell sarcoma, epithelioid sarcoma, and rheumatoid arthritis [ 3 , 4 ]. In rheumatoid arthritis, initially, the inflammatory tissue thickens at the bare areas and gradually extends into the joint space across the cartilaginous surfaces [ 5 ].…”