摘要
目的分析外周性原始神经外胚层肿瘤(pPNET)的CT与MRI表现,以提高对本病的认识。方法回顾性分析我院经病理证实的6例原始神经外胚层肿瘤的CT和MRI表现。6例全部行CT检查,其中3例同时行MRI检查。结果2例位于颅内,2例位于四肢,1例位于腹膜后,1例位于前纵隔。软组织pPNET的CT表现为大的、边界不清的软组织肿块,密度不均匀伴坏死囊变,不伴钙化,增强后呈不均匀强化,骨pPNET主要表现为较大的溶骨性骨质破坏伴软组织肿块,有1例可见瘤骨形成,增强后不均匀强化。MRI在SE的T1WI上表现为等肌肉信号,T2WI上表现为不均匀高信号,部分病例可见假包膜改变。结论pPNET的CT与MRI缺乏明确特征表现,但能较好地显示肿瘤的内部结构、明确肿瘤的范围,有助于本病的鉴别诊断、判定手术切除的可能性、检出远处转移和评价治疗效果。
Objective To analyze the CT and MRI appearances of peripheral primitive neuroectodermal tumors （pPNET）, and to improve the knowledge of the disease. Methods CT or MR examinations were performed in six cases of pPNET being pathologically confirmed. Results Two cases occurred in intracalvarium, two in extremities, one in retroperitoneum, and one in anterior mediastinum. The CT appearance of the tumors in soft tissue was a large, ill-defined, non-calcified and heterogeneous mass cystic areas. The tumors demonstrated heterogeneous contrast enhancement. The pPNET in bone showed extensive lytic lesion with a large soft tissue mass, of which one case had newly born bone, and tumors showed heterogeneous contrast enhancement. Tumors showed homogeneous signal intensity on SE TlWI and heterogeneously high signal intensity on T2WI. Some of them had pseudocapsule. Conclusion The manifestations of pPNET on CT and MRI have no characteristics. However, CT and MRI can show the intra-tumor structures and the extent of the tumor, which is helpful in differential diagnosis, predicting resectability, detecting distant metastases and evaluating the response to treatments.
出处
《中国医学影像技术》
CSCD
北大核心
2006年第1期129-131,共3页
Chinese Journal of Medical Imaging Technology
关键词
原始神经外胚层肿瘤
体层摄影术
X线计算机
磁共振成像
Primitive neuroectodermal tumor
Tomography, X-ray cornputered
Magnetic resonance imaging
