成人幕上原始神经外胚层肿瘤的影像学特征

Imaging Findings of Supratentorial Primitive Neuroectodermal Tumors in Adults

目的探讨成人幕上原始神经外胚层肿瘤(primitive neuroectodermal tumors,PNET)的影像学特点,以提高对本病的认识。方法回顾性分析经手术病理证实的6例成人幕上PNET的CT及MRI表现(其中CT检查2例、MRI检查4例)。结果 6例PNET中,位于幕上大脑半球颞叶3例、额顶叶2例及基底节区1例。肿瘤实质CT平扫2例均呈稍高密度;4例经MRI扫描,T1WI呈等、稍低信号,T2WI呈等、稍高信号,增强扫描肿瘤实质明显强化2例、轻度强化2例。病灶体积较大,内含囊变/坏死4例、出血2例及流空血管1例,边界较清,瘤周无或轻度水肿5例,大片水肿1例。结论充分认识成人幕上PNET的影像学表现特征,有助于提高术前诊断率。

Objective To investigate the imaging features of supratentorial primitive neuroectodermal tumors（PNET） in adults. Methods 6 cases of supratentorial PNETs in adult which proved by surgery and pathology were analyzed retrospectively（2 cases were examined by CT scan and 4 by MR scan）. Results The lesions of 6 cases were located in cerebral hemisphere included temporal lobes（3 cases）, frontoparietal lobes（2 cases ） and Basal ganglia（1 case）. 2 cases of CT imagings showed a slightly high density and 4 cases of MRI were isointensity or slightly hypointensity on T1WI and isointensity or slightly hyperintensity on T2WI. MR enhanced scan, 2 cases of them demonstrated marked enhancemen% another 2 were mild. The lesions were large and the edge is clear, 5 cases without or with slight peritumor edema and 1 case with obvious edema. Most of them contained cystic and necrotic areas, hemorrhage and intratumoral vessels. Concluston Fully understand the imaging features of adult supratentorial PNETs, is helpful to improve the preoperative diagnostic accuracy.