中枢神经细胞瘤的MRI诊断

MRI diagnosis of central neurocytoma

目的探讨中枢神经细胞瘤（cNc）的MRI表现特征。方法南方医科大学珠江医院自2007年1月至2010年1月行手术治疗CNC患者13例，术前均行MRI平扫及增强扫描．其中1例并行术前CT平扫及增强扫描。总结分析患者的临床、MRI资料及病理表现。结果肿瘤最大径约3．2-8．5cm，12例CNC位于侧脑室内孟氏孔区，l例位于左颞顶叶脑实质内．均表现为分叶状的实体瘤，平扫以等T1、稍长T2信号为主，信号不均匀，可见多发、散在分布的小囊变区，表现为更长T1、更长T2信号；6例T2WI上可见流空血管影；8例见斑点状稍短T1信号：增强扫描肿瘤呈不均匀显著强化，6例可见强化肿瘤血管；病理表现为灶性钙化，可见典型无细胞纤维岛。结论脑室内CNC具有特征性的发病部位，结合患者发病年龄、MRI平扫及增强扫描表现多可做出正确诊断；脑室外CNC定性诊断较困难。

Objective To evaluate the MRI features of central neurocytoma （CNC）. Methods Thirteen patients with CNC （7 males and 6 females, aged 18-28）, admitted to our hospital from January 2007 to January 2010, were chosen; preoperative plain and contrast enhanced MR/scans were performed on these 13 patients and 1 also received CT scan of these patients were retrospectively analyzed. The clinical and imaging data and pathological features Results The largest tumor enjoyed its maximum diameter of 3.2-8.5 cm; the CNC in 12 patients located at the lateral ventricle and that in 1 patient at the parenchyma of the left frontal and temporal lobes. Lobulated solid tumors were noted in these lesions, showing T1 isointense and T2 hyperintense in MRI; some multiple, scattered cystic lesions showed stronger T1 and T2 signal than the former ones; vascular ＂flow void＂ signal was shown in 6 patients in T2WI, and slightly weak T1 signal was shown in 8. All the tumors demonstrated inhomogeneous enhancement and the tumor vessels in 6 patients were noted under contrast Mill. Focal calcification was found. Conclusion CNC in the lateral ventricle enjoys typical location; considering the age of patients, non-contrast and contrast MRI findings, correct diagnosis of CNC can be made; however, CNC outside the lateral ventricle is hard to diagnose.