典型影像病例图片
医学影像网欢迎您!
医学影像放射诊断学ppt课件
医学影像经典病例分析
医学影像解剖病理诊断知识
医学影像图库
医学影像资源下载
医学影像技术
医学影像论坛
医学影像网 返回首页
您当前的位置:首页 > 神经系统病例 > 周围神经

迷走神经鞘瘤(Vagal Schwannoma (Path proven) )CT-MRI病例图片影像诊断分析

时间:2010-11-01  来源:ACR Friday, July 17, 2009  作者:freemanpyw译 【复制分享】【讨论-纠错】【举报

TpU影像园XCTMR.com

【讨论】:Schwannomas are benign neoplasms which arise from the nerve sheath and consist of schwann cells in a collagenous matrix. Histologically, the terms Antoni type A and Antoni type B are used to describe varying growth patterns. Type A tissue has elongated spindle cells and is compact in nature while type B has a looser organization with cystic spaces intermixed within the tissue. These cystic spaces result in high signal intensity on T2 weighted MR sequences.TpU影像园XCTMR.com

    神经鞘瘤是一种良性肿块,起源于神经鞘,在其胶原基质内包含有许旺氏细胞。在组织学上,术语Antoni A型和Antoni B型被用于描述不同的生长方式。A型组织有狭长的梭形细胞并且结构致密,而Antoni B型有一个疏松的结构,组织内混合有囊性间隙。这些囊性间隙导致在MRT2序列上呈高信号。TpU影像园XCTMR.com
TpU影像园XCTMR.com
    Vestibular schwannomas are the most common cranial nerve (CN) schwannoma, followed by trigeminal and facial and then glossopharyngeal and vagus schwannomas. CN schwannomas are usually isolated lesions, except when they are associated with neurofibromatosis type 2 (NF2). NF2 is characterized by bilateral acoustic schwannomas but other CN schwannomas also occur at an increased frequency in these patients.TpU影像园XCTMR.com

    听神经鞘瘤是最常见的中枢神经神经鞘瘤,其次是三叉神经和面神经,然后是舌咽神经和迷走神经鞘瘤。中枢神经神经鞘瘤通常是孤立性并不,除了在神经纤维瘤病2型中,NF2以双侧听神经鞘瘤为特征,但在这些病人中,其他神经鞘瘤的发生率也相应提高了。TpU影像园XCTMR.com
TpU影像园XCTMR.com
    The majority of carotid space masses are benign, with the two most common lesions being the vagus schwannoma and the glomus tumor. Neoplasms of the vagus nerve include paragangliomas (50%), schwannomas (31%), neurofibromas (14%), and neurofibrosarcomas (6%). Most cases of schwannomas manifest between the third and sixth decades of life as a firm and painless mass in the neck.TpU影像园XCTMR.com

    大部分的颈动脉间隙肿瘤是良性的,最常见的并不是迷走神经鞘瘤和血管球瘤。迷走神经肿瘤包括副神经节瘤(50%),神经鞘瘤(31%),神经纤维瘤(14),以及神经纤维肉瘤。大部分的神经鞘瘤发生在30-60岁,表现为固定的无痛性肿块。TpU影像园XCTMR.com
TpU影像园XCTMR.com
    Schwannomas of the vagus nerve are usually well-defined, rounded structures which are hypodense to muscle on CT and enhance moderately. On MR, there is variable T2 signal intensity depending on its content of Antoni A and Antoni B tissue. Hemorrhage and cystic degeneration are not uncommon. They result in anterior displacement of the carotids. In contrast, glomus tumors are highly vascular and demonstrate dramatic enhancement. Flow voids are usually visualized, resulting in the characteristic salt-and-pepper appearance. Carotid body tumors tend to splay the internal and external carotid arteries away from each other, while glomus vagale tumors displace the carotid artery anteriorly. The distinction between a vagus schwannoma and the glomus vagale tumor has to be made on the basis of flow voids and vascular flow curves. Also, glomus vagale tumors are relatively uncommon.TpU影像园XCTMR.com

    迷走神经鞘瘤通常边界清楚、类圆形结构,与肌肉密度相比呈低密度,中度强化。在MRI上,以及其内Antoni A和Antoni B型组织的内容不同其T2表现为不同的信号强度。出血和囊变并非罕见。肿块导致颈动脉前移,增强扫描,血管球瘤是富血供的、明显强化。常常可以看见流空信号,导致特征性的胡椒拌盐征。颈动脉体瘤倾向于扩大分离颈内外动脉,而迷走神经血管球瘤向前推移颈动脉。迷走神经鞘瘤和血管球瘤之间区别基于流空和血管流量,同时迷走神经血管球瘤是相对少见的。TpU影像园XCTMR.com

  参考文献:
| 转到上一篇 | 转到下一篇 | 复制链接 | 加入收藏 | 返回首页 | 分享到:
颅内脱髓鞘假瘤影像学表现
颅内脱髓鞘假瘤影
肝脏感染性病变影像学鉴别诊断和潜在陷阱(一)
肝脏感染性病变影
浸润型肝癌:放射科医生需要知道些什么?(一)
浸润型肝癌:放射
中枢神经细胞瘤(central neurocytomas)影像学特点综述
中枢神经细胞瘤(
    相关内容:
发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表
推荐图片
赞助商链接
热门内容
影像解剖
赞助商链接
最新内容