Acta Neuropathologica:脑内钆沉积的组织学特征——一例临床报告

2020-07-18 MedSci原创 MedSci原创

钆基造影剂(GBCA)是临床上用来提高MRI扫描诊断准确性的MRI造影剂

接受多次Gd造影剂的非肾损害患者中,Gd在正常人组织,尤其是齿状核(DN)和苍白球(Gp)中长期沉积。因为每年有超过3000万患者接受对比增强磁共振成像。虽然几乎没有证据表明这种长期形式的Gd沉积会导致任何临床表现,但一些GBCA与肾损害患者的肾源性系统性硬化症(Nsf)密切相关。

作者报道了一例女性NF1和2级星形细胞瘤患者,这位16岁的女孩(已经去世),患有神经纤维瘤病1型(NF 1),低度星形细胞瘤,肾功能正常。她在4个月时被诊断出患有NF1。脑部核磁共振显示视神经束和下丘脑增大。活检证实为2级星形细胞瘤。她在10岁时接受了左翼部开颅术和肿瘤切除术,并接受了数个疗程的化疗。总共,她接受了21剂Omniscan和28剂MultiHance(0.1mmol/kg)。

方法:所有成像均在1.5和3t场强的通用电气MRI扫描仪上进行。对照标本取自一名18岁死亡患者的DN,无MRI对比剂暴露史。进行了透射电镜和电子探针分析。利用ICP-MS对组织消化物中的钆进行定量分析。DN的TEM显示血管周围的圆形沉积物,直径70-190nm,中间密度高,血管外膜密度比较低。由直径约6nm的径向排列和交织的细丝组成。DN中Gd含量为2.9µg/g

结果意义:首次证明Gd沉积与DN和GP血管周围暗染沉积有关。使用TEM和EMPA确认这些沉积物来自Gd。由于Gd沉积发生在肾功能正常的患者,任何接受GBCAs的患者都有Gd沉积的风险。进一步研究沉积机制和潜在的长期健康影响是有必要的。

Zhang, R.R., Matkovic, E., Fournelle, J.H. et al. Histological features of gadolinium deposition in the brain, a case report. Acta Neuropathol 140, 241–244 (2020). https://doi.org/10.1007/s00401-020-02159-1

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    2021-01-01 windight
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    2021-06-12 yb6560
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