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目的分析外周性原始神经外胚层肿瘤(PNET)的CT及MRI影像表现。方法回顾性分析经病理证实的10例外周性PNET临床资料及影像学表现。10例行CT,其中2例行MRI检查。男、女各5例。年龄11～54岁,平均24岁。结果发病部位:胸壁4例,腹部及鼻窦各2例,颈椎和肱骨各1例。胸壁及腹部病变表现为较大肿块,直径5～16cm,梭形或椭圆形,分叶状,密度多不均匀。胸壁病变伴有不同程度骨质破坏或骨膜增生。增强后实质部分强化。鼻窦病变见肿块及骨质破坏。颈椎及肱骨病变表现为T1WI等信号,T2WI高信号,抑脂信号增高,肿块突出于骨轮廓之外。有远处转移3例。结论外周性PNET有一定临床表现特点,胸壁病变较具影像特征。CT、MRI可较好显示肿瘤内部结构及范围。
Objective To analyze CT and MRI findings of peripheral primitive neuroectodermal tumors (PNET). Methods Retrospective analysis of 10 cases of pathologically confirmed peripheral PNET clinical data and imaging findings. CT was performed in 10 cases, of which 2 cases were examined by MRI. Male and female each 5 cases. Age 11 to 54 years old, average 24 years old. Results The incidence of parts: 4 cases of chest wall, abdomen and sinus in 2 cases, 1 case of cervical and humerus. Chest wall and abdominal lesions showed larger lumps, diameter 5 ~ 16cm, fusiform or oval, lobulated, density and more uneven. Chest wall lesions with varying degrees of bone destruction or periosteal proliferation. Strengthen the substantial part of the enhancement. Sinus lesions and bone destruction seen. Cervical and humerus lesions showed T1WI and other signals, T2WI high signal, increased fat signal, the mass prominent in the bone contour. There are 3 cases distant metastasis. Conclusion Peripheral PNET has some clinical features, and chest wall lesions have more imaging features. CT, MRI can better display the internal structure of the tumor and scope.