The concept of localized and diffuse tenosynovial giant cell tumors (TSGCT) is recent and may still cause some confusion among surgeons. This disorder constitutes a family of proliferative lesions characterized by their origin in the articular synovium, tendon sheaths, or bursa. It is not always easy to diagnose this pathology, especially due to its multitude of presentation. We describe an incidentally found localized TSGCT intra-articularly located in the shoulder. The localized lesions are considered a more benign form that usually present not with specific symptoms but rather a manifestation of the disturbance in the affected joint or the surrounding soft tissues. MRI is indispensable for its diagnosis, and the standard treatment is complete surgical resection. Due to its low incidence, it is difficult to find literature that goes beyond clinical reports or small case series. With this report, we intend to call readers’ attention for the variable presentations, the different diagnostic and treatment strategies, and the expected outcomes.
Case Rep Orthop Res 2021;4:224–228

中文翻译：

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局部腱鞘巨细胞瘤：肩部偶然发现的病变

局部和弥漫性腱鞘巨细胞瘤 (TSGCT) 的概念是最近才出现的，可能仍会在外科医生中引起一些混淆。这种疾病构成了一个以起源于关节滑膜、腱鞘或滑囊为特征的增生性病变家族。诊断这种病理并不总是那么容易，尤其是由于其表现形式众多。我们描述了一个偶然发现的位于肩关节内的局部 TSGCT。局部病变被认为是一种更良性的形式，通常不表现出特定的症状，而是受累关节或周围软组织紊乱的表现。MRI对其诊断必不可少，标准治疗是手术切除。由于发病率低，很难找到超越临床报告或小病例系列的文献。通过这份报告，我们打算让读者注意可变的呈现方式、不同的诊断和治疗策略以及预期的结果。
案例代表 Orthop Res 2021；4:224–228