Epidemiology
A benign fibrous tumor seen mainly in the hands, fingers, and wrist of adults. In the hand it can limit tendon gliding or mobility, so function matters as much as size.
Basic features
It appears as a firm nodule attached to a tendon or its sheath, and it can limit movement or be mistaken for a localized tenosynovial giant cell tumor (TGCT).
Usual treatment
Careful local excision is the usual treatment when there are symptoms or the diagnosis is uncertain.
Outcomes and prognosis
It can come back locally, but it does not spread (metastasize) and generally keeps good function.