后纵隔节细胞神经瘤的CT、MR表现

Posterior mediastinal ganglioneuroma:CT and MR findings

目的:提高对后纵隔节细胞神经瘤(Posterior mediastinal ganglioneuroma,PMGN)的认识。材料和方法:搜集10例经手术病理证实为PMGN患者的临床、影像学资料(5例行CT检查,1例行MR检查,4例同时行CT及MR检查),并对其CT、MR表现进行分析、总结。结果:影像学上,PMGN瘤体上下径大于前后径及左右径,且紧贴脊椎生长。我们将本组PMGN根据其是否累及邻近的椎管分为椎管相关性节细胞神经瘤(GN)(n=1)和非椎管相关性GN(n=9),另外根据肿瘤的生长方式又分为单侧型(n=7)和跨中线型(n=3)。CT平扫表现为均匀或不均匀性低密度,1例内可见散在点状钙化,1例内可见片絮状脂肪密度影;增强扫描表现为无强化或轻中度不均匀或均匀强化。MR上,T1WI病灶均表现为均匀低信号,T2WI病灶均表现为不均匀稍高信号,T1WI增强扫描1例表现为不均匀混杂强化,其余表现为无强化。结论:PMGN在CT及MR上具有一定特点,对其特征性表现提高认识,有助于做出正确的诊断。

To improve recognition of posterior mediastinal ganglioneuroma （PMGN）. Materials and Methods： Clinical and imaging materials（five cases were performed CT only, one case was underwent MR only, and four cases were per formed both CT and MR scans） of 10 cases histologically proved PMGN were analyzed retrospectively, additionally, CT and MR findings were summarized. Results： On images, vertical diameters of the PMGNs were bigger than both of anteroposterior and transverse diameters, and tumors grew along the vertebrae. Moreover, we classified PMGNs in our study into vertebral canal associated （n=l） and non vertebral canal-associated （n=9） GN on the basis of adjacent vertebral canal involved or not. Additionally, we grouped them into unilateral type （n=7） and acrossing middle fine type （n=3） according to the growth pattern. On plain CT, GNs were showed homogeneous or heterogeneous hypointense, scattering punctate calcification and patchy fat density were seen in one case, respectively. There were non enhancement or mild to moderate homogeneous or heterogeneous enhancement on enhanced CT. On MRI, T1WI showed homogeneous low signal and T2WI demonstrated obvious heterogeneous high signal intensity. With contrast material, there was heterogeneous enhancement or non enhancement. Conclusions： PMGNs have some characteristics on CT and MR, we should make right diagnosis after thoroughly analysis.