外周性原始神经外胚层肿瘤的影像表现  

Imaging Features of Peripheral Primitive Neuroectodermal Tumors

作　　者：陈杰[1] 胡春洪[1] 陈剑华[1] 沈海林[1] 郭亮[1] 傅引弟[1] 丁乙[1] 

机构地区：[1]苏州大学附属第一医院影像中心,江苏苏州215006

出　　处：《实用放射学杂志》2006年第1期67-68,94,共3页Journal of Practical Radiology

摘　　要：目的分析外周原始神经外胚层肿瘤(pPNET)的CT和MR I表现,以期提高对该病的认识。方法回顾性分析6例经病理诊断的外周原始神经外胚层肿瘤的CT和MR I表现。男4例,女2例,其中起源于骨组织2例,软组织pPNET 4例。结果骨组织pPNET表现为溶骨性骨质破坏伴有软组织肿块,病灶CT呈等密度,MR I T1W I等信号,T2W I等、高信号,增强明显但不规则,无明显瘤骨和骨膜反应;软组织pPNET病灶体积比较大,直径>6 cm,CT等密度,MR I T1W I等、低信号,T2W I等、高信号,增强明显,对周围正常组织有侵袭,无钙化。2例有明显的坏死。结论pPNET的CT和MR I表现缺乏特征性,但有助于本病良恶性鉴别、判断手术可切除性、检出远处转移和评价治疗效果。Objective To describe the imaging features of peripheral primitive neuroectodermal tumor（pPNET）. Methods CT and MR1 imagings in six patients with pPNET proved pathologically were reviewed retrospectively . Four were male , others were female . Two cases lvcalized in came from the bone,the rest in soft tissue. Results pPNET in bone showed lyric lesion with soft tissue mass. The lesion presented isodensity on CT and isointensity on T1WI and iso-or hyperintensity on T2 WI. In 1 case with contrast enhancement, marked heterogeneous enhancement was present. There was periosteal reaction, pPNET in soft tissue appeared as a large masses which were larger than 6 cm in diameter. The lesion showed iso density on CT imagings and iso-or hypointensity on T1WI , iso-or hyperintensity on T2WI and marked enhancement. Surrounding normal tissues were invaded without calcification. 2 of all had necrosis markedly. Conclusion Although CT and MRI findings of pPNET are nonspecific, the imaging is useful in differentiating the nature of tumor, predicting resectiblity, detecting distant metastases and evaluating treatment.

关 键 词：神经外胚瘤 外周 体层摄影术 X线计算机 磁共振成像 

分 类 号：R738.1[医药卫生—肿瘤] R814.42[医药卫生—临床医学]