Abstract：
UNASSIGNED: Giant cell tumor of the tendon sheath (GCTTS) is commonly seen in the appendicular skeleton, and rarely arises from the axial skeleton. We describe a rare case of GCTTS in an adolescent in the upper cervical spine.
UNASSIGNED: A previously healthy 16-year-old boy presented with a 6-month history of numbness of right upper extremity, and had experienced a neck pain 4 months ago. Spinal MRI demonstrated a small syrinx at C2 level and a well-circumscribed extradural mass with contrast enhancement extending from the posterior arch of C1 to C2. The extradural mass was totally resected, and the syrinx underwent clinical and imaging surveillance.
UNASSIGNED: GCTTS should be considered in the differential diagnosis of the axial skeletal lesion although very rare. Gross-total resection is advocated in GCTTS of the upper cervical spine, and subtotal resection with meticulous lesion monitoring should be performed in unresectable cases.
UNASSIGNED: A previously healthy 16-year-old boy presented with a 6-month history of numbness of right upper extremity, and had experienced a neck pain 4 months ago. Spinal MRI demonstrated a small syrinx at C2 level and a well-circumscribed extradural mass with contrast enhancement extending from the posterior arch of C1 to C2. The extradural mass was totally resected, and the syrinx underwent clinical and imaging surveillance.
UNASSIGNED: GCTTS should be considered in the differential diagnosis of the axial skeletal lesion although very rare. Gross-total resection is advocated in GCTTS of the upper cervical spine, and subtotal resection with meticulous lesion monitoring should be performed in unresectable cases.
摘要：
未经证实：腱鞘巨细胞瘤（GCTTS）常见于阑尾骨骼，很少出现在轴向骨架上。我们描述了上颈椎青少年中罕见的GCTTS病例。
未经证实：一个健康的16岁男孩，有6个月的右上肢麻木史，4个月前颈部疼痛.脊柱MRI显示C2水平的小注射器和明确的硬膜外肿块，对比剂从C1的后弓延伸到C2。硬膜外肿块被完全切除,和syrinx接受了临床和影像学监测。
UNASSIGNED：尽管非常罕见，但在轴性骨骼病变的鉴别诊断中应考虑GCTTS。在上颈椎的GCTTS中提倡全切除，对于无法切除的病例，应进行次全切除并进行细致的病变监测。
未经证实：一个健康的16岁男孩，有6个月的右上肢麻木史，4个月前颈部疼痛.脊柱MRI显示C2水平的小注射器和明确的硬膜外肿块，对比剂从C1的后弓延伸到C2。硬膜外肿块被完全切除,和syrinx接受了临床和影像学监测。
UNASSIGNED：尽管非常罕见，但在轴性骨骼病变的鉴别诊断中应考虑GCTTS。在上颈椎的GCTTS中提倡全切除，对于无法切除的病例，应进行次全切除并进行细致的病变监测。
