Fibroma of tendon sheath as a cause of carpal tunnel syndrome.

In 1949, Geschickter and Copeland (1) first described fibroma of tendon sheath (FTS) as a distinct entity, but it was not described further until 1979, when Chung and Enzinger (2) presented the clinical and pathological findings of 138 cases selected from the files of the Armed Forces Institute of Pathology. In all cases of FTS reported in literature, only six have been implicated as a cause of carpal tunnel syndrome (CTS). The fibroma described in this report is an example of this rare tumour; it led to the progression of CTS and demonstrated characteristics unique to FTS. Carpal tunnel release and local excision of the tumour promptly relieved the patient’s symptoms.