黑色素性神经鞘瘤2例报道

2020-07-30 侯智 张春青 袁飞 立体定向和功能性神经外科杂志

色素性神经鞘瘤(MS)是一种能产生色素的神经鞘瘤,是神经鞘瘤的罕见变异,我科2019年3月收治2例该病例,现报道如下。

色素性神经鞘瘤(MS)是一种能产生色素的神经鞘瘤,是神经鞘瘤的罕见变异,我科2019年3月收治2例该病例,现报道如下。

病例1:患者,女,14岁,因左下肢疼痛半年入院,入院查体:腰部脊柱左侧侧弯,左侧腰4、5间隙叩击痛,并向左下肢放射痛,双下肢肌力5级,左下肢直腿抬高试验40度阳性,加强试验阳性。腰椎磁共振提示:腰4~5椎管平面T2WI梭形低信号影,大小4 cm×1.7 cm,强化扫描均匀增强(图1)。


在全麻下行椎管占位切除,术中可见病变呈黑色,有明显边界,质地认,血供丰富,可见一神经根穿入肿瘤,术中全切肿瘤。术后病理提示:CK(灶+)、EMA(灶+)、PR(-)、SOX-10(灶+)、S-100(+)、HMB45(+)、MelanA(+)、Ki-67(5%)、NeuN(灶+),诊断黑色素细胞瘤WHOI级(图2)。


病例2:患者,男,55岁,因头颈部疼痛3月入院。入院查体:右侧面部痛温觉稍减退,余神经系统未见阳性体征。头颅MR提示右侧中后颅窝可见不规则结节影,大小3.4 cm×2.2 cm,边界清晰,信号不均匀,T1、T2为高低信号混杂,边缘可见T2低信号环,增强后不均匀强化,幕上脑室系统扩张(图3)。


在全麻下经右侧颞下岩前入路切除肿瘤,术中见肿瘤呈黑色,质地韧,血供丰富,肿瘤与三叉神经界限不清,在三叉神经间隙生长,术中全切肿瘤。术后病理提示S-100(部分可疑+)、HMB45(+)、MelanA(+)、SOX(-)、Ki-67(个细胞+),诊断黑色素瘤WHOI级(图4)


色素性神经鞘瘤(melanotic schwannoma,MS)是一类罕见的肿瘤,由MIllca WG 最早于1932年报道,迄今为止文献报道罕见。MS多见于女性,男女比例为1∶1.4,发病高峰年龄30~40岁。MS好发于脊髓后根、交感神经链、颅神经,少见于周围神经与内脏神经。

2013年版WHO 软组织肿瘤分类中首次将黑色素性血旺细胞瘤生物学行为确定为ICD-1(局部侵袭性),定义为一种罕见的迟发性转移性神经鞘瘤,由多少不等的产生黑色素的血旺细胞构成。组织学分型分为非沙砾体型与沙砾体型,沙砾体型中有约50%病例患有PPKAR1A突变的Garney综合征。病理特点:绝大多数肿瘤富于细胞,肿瘤细胞呈梭形、多角形或上皮样,内含大量黑色素,细胞常呈圆形或卵圆形。免疫组化提示:S-100、HMB45、MelanA、Leu-7均阳性,GFAP不表达。电镜观察细胞具有神经鞘瘤特征,胞质内有不同发育阶段的黑色素小体。

既往认为,黑色素性神经鞘瘤属于良性惰性病变,Torres-Mora等研究显示,MS原位复发率为35%、转移率为44%。治疗上采用手术切除为主,手术完整切除后,需要长期随访的原位复发和远处转移。对于切除不全者术后需放疗,总剂量54GY。对于复发转移的病例对于放疗和化疗均不敏感。多数医生对该肿瘤认识不够,容易判断为恶性黑色素瘤导致手术中切除不完全,术中快速冰冻有利于与恶性黑色素瘤鉴别。

原始出处:

侯智,张春青,袁飞,秦逊,柯燕燕.黑色素性神经鞘瘤2例报道[J].立体定向和功能性神经外科杂志,2019,32(03):172-173.

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    2021-04-07 Homburg
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    2020-10-07 sunylz
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    2020-10-18 14769249m80暂无昵称

    学习了

    0

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