摘要
【目的】探讨腹膜后脂肪肉瘤的MRI表现,并与病理学结果做对照研究。【方法】回顾性分析19例经病理证实的腹膜后脂肪肉瘤。所有病例均行MRI平扫和增强扫描。【结果】黏液型脂肪肉瘤MRI上以T1WI低信号、T2WI高信号为主;组织学上以黏液成分为主,脂肪含量少,增强后可见明显强化的实性成分和粗大的间隔影。高分化脂肪肉瘤,成熟脂肪成分占75%,并可见纤细的间隔影。圆细胞型和多形性脂肪肉瘤的MRI表现没有特征性;其中圆细胞型脂肪肉瘤可见瘤内出血。去分化型脂肪肉瘤中可见少许脂肪成分,且脂肪成分和非脂肪性实性组织间分界非常清楚。【结论】不同组织亚型的腹膜后脂肪肉瘤的MRI表现不同,取决于其组织学成分;MRI可以清楚地显示其形态、内部成分和周边结构,是诊断腹膜后脂肪肉瘤的理想方法。
[Objective] To evaluate MRI features of retroperitoneal lipesarcomas and compare it with pathological findings. [Methods] Nineteen cases of retroperitoneal lipesarcomas proved pathologically were retrospectively analyzed. All patients underwent MRI examination before and after intravenous administration of contrast agent. [Results] There are 5 subtypes of retroperitoneal liposarcomas. Myxoid lipesarcomas exhibited mainly loW signal intensity on T1-weighted image, high signal intensity on T2-weighted image. At histologic analysis, myxoid liposarcoma consists of myxoid matrix as the predominant component and small amounts of mature fat. Enhanced solid tissues and thicked septa of myxoid lipesarcoma were seen on post-contrast image. Among of well- differentiated liposarcomas, mature fatty components accounted for 75%, with enhanced tenuous septa and solid tissues on post-contrast images. Round-cell lipesarcomas and pleomorphic lipesarcomas exhibited soft-tissue tumor signal intensity without characteristic fat signal. Round cell liposarcoma appeared intratumoral hemorrhage. Dedifferentiated liposarcomas exhibited small amounts of fatty components with a clear demarcation between fat and nonadipose solid tissue on MR images. [Conclusion] Different subtypes of retroperltoneal liposarcomas exhibited varying MRI features, depending on their histological components. MRI can clearly demonstrate tumor＇s shape, margin, internal components and surmunding tissues. MRI should be an ideal method in diagnosing retroperitoneal liposarcoma.
出处
《中山大学学报（医学科学版）》
CAS
CSCD
北大核心
2007年第1期83-87,共5页
Journal of Sun Yat-Sen University:Medical Sciences
关键词
腹膜后
脂肪肉瘤
MRI
病理
retroperitoneum
liposarcoma
MRI
pathology
