General
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• Lobular, circumscribed fibroblastic process of extremities (Stanford University)
• Rarely originates from synovial membrane of joint capsule
• May be related to fibrous histiocytoma of tendon sheath due to similar location, clinical presentation and recurrence rate

Terminology
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• Also called tenosynovial fibroma

Epidemiology
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• Any age, peaks at 20-30 years, usually males

Case reports
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• 17 year old boy with large, tense knee effusion following trauma (Indian J Orthop 2011;45:276)
• 20 year old woman with two month history of difficulty extending ring finger (J Hand Microsurg 2010;2:31)
• 58 year old man with 2 year history of progressive localized swelling of ankle joint (J Orthop Traumatol 2009;10:147)

Gross description
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• Smooth, dense, multinodular mass, pearly white, 0.5-5.5 cm

Gross images
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Multilobular mass

3.5×2cm mass

Micro description
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• Lobulated, with lobules divided by narrow cleft like spaces; nodules composed of fibroblasts; narrow vessels, large amounts of dense collagenous tissue, markedly hyalinized
• May have foci of myxoid change
• Compared to fibrous histiocytoma of tendon sheath, is less cellular with no xanthoma cells and no giant cells

Micro images
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H&E

Various images

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