Intraarticular Involvement of Extraarticular Giant Cell Tumor of the Tendon Sheath in the Thumb of a Pediatric Patient: A Case Report.
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Giant cell tumors of the tendon sheath (GCTTS) are locally invasive and have a high likelihood of recurrence in adults, but it is rare in children. Its potential to be invasive or recur has not been characterized. We present a 9-year-old patient with a dumbbell-shaped GCTTS that had small intraarticular and large extraarticular components with a narrow connection between them. This case suggests that GCTTS can be locally invasive in children. This case report could help hand surgeons who treat GCTTS in children.