【摘要】 目的 回顾性分析脑室外神经细胞瘤（EVN）的MR影像学表现及其鉴别诊断。方法 经手术病理证实7例EVN患者，行MR平扫及增强扫描，其中1例患者行扩散加权成像（DWI）扫描。结果 病变发生于大脑4例，小脑2例，均有灰白质受累，鞍区1例。囊实性病变5例，实性病变2例。5例边界清楚，2例边界不清。2例病灶可见瘤周水肿。实性部分T₁WI呈等、稍低信号，T₂WI呈等、稍高信号5例，可见出血及坏死。实性部分可呈轻度、中度或明显不均匀强化，囊性部分呈薄壁环形强化。结论 EVN的MRI表现具有一定的特点，脑内边界清楚的囊实性病变，同时累及灰白质，应考虑该病诊断的可能。更多还原

【Abstract】 Objective To analyze retrospectively the MR manifestations and differential diagnosis of extraventricular neurocytoma（EVN）. Methods 7 patients with EVN confirmed by pathologic examination were performed non-enhanced and contrast-enhanced MR scan, and one of them was also performed DWI.Results 4 tumors were located in cerebra, 2 tumors located in cerebellum, involving both cortex and white matter, and 1 tumor was located in the seller region. 5 tumors were solid-cystic lesions and 2 tumors were solid lesions. 5 lesions were well demarcated and 2 lesions were ill defined. Edema around the lesion was found in 2 cases. The solid part of tumors showed iso-or hyper intensity on T₁WI, hypo-or hyper intensity on T₂WI. Necrosis and hemorrhage occurred in some cases. The degree of enhancement in solid part ranged from mild enhancement to intense enhancement heterogeneously. The cystic part showed ring like enhancement with a thin wall. Conclusion The manifestations of EVN on MRI have some characteristics. If a solid-cystic lesion was well defined, involving both cortex and white matter, EVN should be considered.更多还原