CT and MRI findings of central neurocytoma and extraventricular neurocytoma
TANG Le-mei1, NING Dian-xiu2, NIU Tian-li2, ZHENG Cheng-cheng2, WU Jian-lin3, LANG Zhi-jin2, MIAO Yan-wei2
1.Graduate College of Tianjin Medical University, Tianjin 300070, China;2.Department of Radiology, the First Affiliated Hospital of Dalian Medical University, Dalian Liaoning 116011, China;3.Department of Radiology, Dalian University Affiliated Zhongshan Hospital, Dalian Liaoning 116000, China
Abstract：Objective: To study the CT and MRI characteristics of central neurocytoma(CNC) and extraventricular neurocytoma(EVN)． Materials and Methods: The imaging findings of 7 CNC and 2 EVN were analyzed retrospectively, and all cases were proved by operation and pathology. The lesions’ location, shape, size, boundary, signal intensity, cystic degeneration, calcification, enhancement characteristics, and the presence of flow-void sign were analyzed. Results: Seven CNC tumors were all located in the lateral ventricles, and the septum pellucidum were not shown or displaced． The lobular tumors are all hyperintense on CT plain scan, hypointense or isointense on T1WI and isointense on T2WI, with different size of cystic degeneration in 5 cases, striatal or gross calcification in 6 cases, and flow-void sign in 4 cases. The tumors demonstrated mild to moderate inhomogeneons enhancement after contrast administration． Two EVN centered in frontal or parietal lobe, with irregular or lobular shapes and ill-defined boundary. The 2 cases were all cyst-solidary mass, with uneven cystic wall and mural nodule, and demonstrated moderate to intense inhomogeneons enhancement after contrast administration. Two cases all demonstrated haemorrhage within the tumor, and one case presented flow-void sign. Conclusion: CNC are charicteristic on CT and MRI． EVN should be considered when a cerebral parenchymal tumor with cystic necrosis, hemorrhage and mural nodule is encountered in younger patients.
2013, Vol. 24 
