摘要
目的探讨腹膜后原始神经外胚层肿瘤(primitive neuroectodermal tumors,PNETs)的MRI表现特征。方法回顾性分析经手术病理证实为腹膜后PNETs的9例患者的MRI资料。结果9例肿瘤为腹膜后单发巨大肿块,3例类圆形,6例不规则分叶状,最大直径约6.3~25.7 cm,平均17.9 cm。8例位于肾脏周围间隙,1例位于盆腔腹膜后间隙。MRI平扫肿瘤呈T1WI等或略低信号,T2WI略高信号,弥散加权成像(diffusion weighted imaging,DWI)呈高信号,内部均出现不同程度的囊变、出血和坏死而信号较混杂。增强扫描动脉期5例囊实性肿瘤呈蜂窝状明显强化,4例实性肿瘤不均匀轻~中度强化;静脉期9例均持续强化。9例肿瘤均侵犯邻近结构,其中2例局部包绕肾脏,3例周边广泛侵犯。2例伴有耻骨转移,3例伴有肾门淋巴结转移。结论MRI可以显示腹膜后PNETs的一些病理学改变,对其诊断及鉴别具有较大价值。
Objective To investigate the MRI features of retroperitoneal primitive neuroectodermal tumors(PNETs).Methods The MRI data of 9 patients with retroperitoneal PNETs confirmed by surgical pathology were analyzed retrospectively.Results The tumors in all 9 patients were solitary large retroperitoneal masses,3 round masses and 6 irregular lobulated masses,with a maximum diameter of 6.3-25.7 cm and a mean diameter of 17.9 cm.Tumors in 8 patients were located in the perirenal space and in one patient in the retroperitoneal space of pelvic cavity.MRI plain scan showed equal or mildly lower signal on T1WI and mildly higher signal on T2WI,while higher signal on diffusion weighted imaging(DWI).All the internal lesions showed different degrees of cystic degeneration,hemorrhage and necrosis with mixed signals.Enhanced MRI scan showed 5 cystic and solid tumors with obvious honeycomb enhancement and 4 solid tumors with uneven mild to moderate enhancement in arterial phase;and all 9 patients showed continued enhancement in venous phase.All the 9 tumors involved adjacent tissues,including 2 with local renal involvement and 3 with extensive peripheral involvement.Two patients showed pubic metastasis and 3 with hilar lymph node metastasis.Conclusion MRI can reflect some pathological features of retroperitoneal PNETs,which have great value in the diagnosis and differentiation of PNETs.
作者
王春
周建军
章顺壮
Wang Chun;Zhou Jianjun;Zhang Shunzhuang(Department of Radiology,Affiliated Cixi Hospital of Wenzhou Medical University,Cixi 315300,China;Department of Radiology,Affiliated Zhongshan Hospital of Fudan University,Shanghai 200032)
出处
《实用肿瘤杂志》
CAS
2019年第6期550-554,共5页
Journal of Practical Oncology
关键词
腹膜后肿瘤/影像诊断
腹膜后肿瘤/病理学
神经外胚瘤
原始/病理学
神经外胚瘤
原始/影像诊断
磁共振成像
回顾性研究
retroperitoneal neoplasms/diagnostic imaging
retroperitoneal neoplasms/pathology
neuroectodermal tumors,primitive/pathology
neuroectodermal tumors,primitive/diagnostic imaging
magnetic resonance imaging
retrospective studies
