Purpose

To evaluate the differences in MR findings between nonhemophilic hemosiderotic synovitis (HS) and diffuse-type tenosynovial giant cell tumor (D-TGCT) of the knee.

Methods

This study included 13 patients with histopathologically confirmed intra-articular hemosiderin deposition of the knee (eight with nonhemophilic HS and five with D-TGCT) who underwent preoperative MR imaging including T2*-weighted images (T2*WI). We retrospectively reviewed the MR images and compared MR findings between the two pathologies.

Results

Lateral meniscus tear and lateral articular cartilage injury (88% vs. 20%, p < 0.05) and distribution in the suprapatellar bursa of the maximum thickness of T2* hypointense synovium (75% vs. 0%, p < 0.05) were significantly more frequent in nonhemophilic HS than in D-TGCT, respectively. Among patients who underwent contrast-enhanced imaging, all five patients with nonhemophilic HS showed minimal to mild enhancement of the thickened synovium with superficial linear enhancement, whereas all four patients with D-TGCT showed moderate to severe enhancement (p < 0.01).

Conclusion

As compared with D-TGCT, lateral meniscus tear, lateral articular cartilage injury, lesser degree of contrast enhancement of the thickened synovium, and distribution in the suprapatellar bursa of the maximum thickness of T2* hypointense synovium were characteristic features of nonhemophilic HS.

中文翻译：

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MR成像发现可将非血友病性铁血滑膜炎与弥漫型膝腱鞘巨细胞瘤区分开。

目的

若要评估非血友病性铁血滑膜滑膜炎（HS）和膝部弥漫型腱鞘巨细胞瘤（D-TGCT）之间的MR发现之间的差异。

方法

该研究包括13例经病理组织学证实为膝关节内铁血黄素沉积的患者（8例为非血友病HS，5例为D-TGCT），这些患者接受了术前MR成像，包括T2 *加权图像（T2 * WI）。我们回顾性地回顾了MR图像，并比较了两种病理之间的MR发现。

结果

外侧半月板撕裂和外侧关节软骨损伤（88％vs. 20％，p  <0.05）以及最大厚度的T2 *低位滑膜滑膜上囊分布（75％vs. 0％，p  <0.05）明显更多非亲血性HS较D-TGCT频繁。在接受造影剂增强成像的患者中，所有五名非血友病性HS患者均表现为增厚的滑膜有轻微至中度的增强和表面线性增强，而所有四名D-TGCT患者均显示了中度至严重的增强（p  <0.01）。

结论

与D-TGCT相比，外侧半月板撕裂，外侧关节软骨损伤，滑膜增厚的对比度增强程度较小，以及T2 *低位滑膜最大厚度的滑膜上囊分布是非亲血性HS的特征。