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Background  Giant cell tumor of the tendon sheath is the most common form of giant cell tumors and is the second most common soft tissue tumor of the hand region after ganglion cyst. Magnetic resonance imaging is the diagnostic tool of choice for both diagnosis and treatment planning. The current standard treatment of choice is simple excision. The main concern about the treatment is related to the high recurrence rates. Besides incomplete excision, there is no consensus concerning the effect of other risk factors on recurrence. The literature lacks detailed reports on surgical excision of these tumors with a standardized surgical treatment and an appropriate patient follow up. The aim of this study was to investigate the recurrence rate and the associated recurrence risk factors for giant cell tumor of tendon sheath of the hand following a standardized treatment.    Methods  The records of patients treated for giant cell tumor of tendon sheath of the hand treated by the same hand surgeon were evaluated retrospectively. The features obtained from preoperative magnetic resonance imaging, final physical examination, patients’ age and sex, anatomical site of the tumor, relationship of the tumor with bone, joint or neurovascular structures, bone invasion, recurrence after surgery and complications like skin necrosis, digital neuropathy or limitation in range of motion were documented. Chi-square test was used to compare categorical variables.    Results  Fifty patient were included in the study. The average follow-up time was 84 months. Three recurrences (6%) were recorded. The only significant risk factor for the recurrence was tumor adjacency to the interphalangeal joints of the fingers other than thumb. No major or minor complications were encountered in the postoperative period.    Conclusion  With adequate surgical exposure and meticulous dissection provided by the magnification loupes, we were able demonstrate one of the lowest recurrence rates in the literature. Well-designed studies combining the recurrence rates of several hand surgery centers implementing a standardized treatment are needed to better demonstrate the associated risk factors for recurrence.

Giant cell tumor of tendon sheath in the hand: analysis of risk factors for recurrence in 50 cases