恶性蝾螈瘤MRI表现:4例报告及文献复习  

MRI manifestations of malignant triton tumor:A report of 4 cases and literature review

作　　者：潘峰[1] 李安琪[1] 袁飞[1] PAN Feng;LI Anqi;YUAN Fei(Department of Radiology,Peking University People’s Hospital,Beijing 100044,China)

机构地区：[1]北京大学人民医院放射科,北京100044

出　　处：《中国介入影像与治疗学》2025年第3期192-195,共4页Chinese Journal of Interventional Imaging and Therapy

摘　　要：目的结合文献回顾性分析恶性蝾螈瘤(MTT)MRI表现。方法回顾性收集4例经手术病理确诊的MTT患者,观察病变MRI表现,并结合文献进行分析。结果4例MTT均为单发病变,分别位于右大腿、骶部右侧、颈部右侧及右肩部,最大径8.05~19.91 cm、平均11.62 cm;形态均不规则,边界不清,呈T1WI等信号、T2WI高信号;瘤内均见坏死,坏死范围小于肿瘤体积50%,呈T1WI低信号、T2WI高信号;肿瘤内部及边缘均见结节样结构,部分边缘结节呈“卫星样”改变;4例均见瘤内分隔,呈T1WI等-高信号、T2WI低信号,其中3例见瘤内束带样结构。增强后2例肿瘤呈中度强化、2例呈明显强化,瘤内坏死区无强化。4例MTT病变均向周围呈弥漫浸润生长,3例瘤周存在广泛水肿、1例瘤周局部水肿,2例见骨侵犯;4例均未见淋巴结转移。结论MTT的MRI表现具有一定特征性。Objective To observe MRI manifestations of malignant triton tumor(MTT)combined with literature review.Methods Four patients with MTT confirmed by operation and pathology were retrospectively collected,and MRI findings were observed and analyzed combined with literature review.Results Single MTT was found in all 4 cases,located in the right thigh,right side of sacral region,neck and right shoulder,respectively,with the maximum diameter of 8.05—19.91 cm,and the average of 11.62 cm.The tumors shaped irregularly with unclear boundaries,presented as isointensity on T1WI and hyperintensity on T2WI.Intratumoral necrosis smaller than 50%of tumor volume was observed in all 4 cases,showing hypointensity on T1WI and hyperintensity on T2WI.Nodular-like structures were noticed both inside and at the edges of tumors,and“satellite”changes could be observed in some marginal nodules.All 4 lesions showed intratumoral separation presented as isointensity or hyperintensity on T1WI and hypointensity on T2WI were detected in all 4 cases,and intratumoral fascicular structures were found in 3 cases.On enhanced MRI,moderate enhancement and obvious enhancement were noticed each in 2 cases,while no enhancement was observed in the necrotic areas.All 4 MTT lesions grew in diffuse infiltration to the around tissue.Extensive peritumoral edema was found in 3 cases,while local peritumoral edema was observed in 1 case,and bone invasion was detected in 2 cases.No lymph node metastasis was observed in 4 cases.Conclusion MRI manifestations of MTT had certain characteristics.

关 键 词：软组织肿瘤 肉瘤 恶性蝾螈瘤 磁共振成像 

分 类 号：R738.6[医药卫生—肿瘤] R445.2[医药卫生—临床医学]