椎管内原发性黑色素细胞肿瘤的MRI诊断

目的 分析总结椎管内原发性黑色素细胞肿瘤的MRI表现.方法 回顾性分析5例椎管内原发性黑色素细胞肿瘤患者MRI资料,重点分析其部位、生长范围、MRI信号特点.结果 5例椎管内黑色素细胞肿瘤患者单个病灶4例,2个病灶1例,共6个病灶.病灶位于颈段、胸段、胸腰段各2个.病灶位于脊髓圆锥部髓内1个,髓外硬膜下5个,未向椎管外生长.肿瘤呈团块状或长梭形.髓内病灶为短T1、长T2信号,5个硬膜下病灶为不同程度短T1、短T2及等T2信号,其中3个病灶为显著的T1聊高信号、T2WI低信号,信号基本均匀,增强扫描见强化.结论 椎管内原发性黑色素细胞肿瘤具有典型MRI信号特点,术前有可能作出准确诊断.

MRI diagnosis of intraspinal primary melanocytic neoplasms

Objective To analyze and summarize the MR findings of intraspinal primary melanocytie neoplasms.Methods Five cases of intraspinal primary melanocytic neoplasms were retrospectively analyzed with emphasis on the location,growth pattern and MR signal intensity features of the tumors.Results A total of six tumors were found in five cases (one case had two tumors).The tumors were located in the cercival spine (2),thoracic spine (2),thoracolumbar junction (2) respectively.One tumor was located in the intramedullary space and 5 tumors in the extrumedullary-intradural space.Growth of the tumors were limited in the intradural space without evidence of extradural extension.The intramedullary tumor exhibited hyperintensity on both T2WI and T1 WI.The intradural tumors showed hyperintensity on T1WI and hypointensity or isointensity on T2WI of various degree.Three of these tumors were predominantly hyperintense on T1 WI and homogeneously hypointense on T2WI.Conclusion The intraspinal primary melanocytic neoplasms could be diagnosed pre-operatively due to their unique signal intensity features on imaging.