隆突性皮肤纤维肉瘤的MRI表现

目的：探讨隆突性皮肤纤维肉瘤的MRI表现。方法：回顾性分析经手术病理证实的隆突性皮肤纤维肉瘤6例。男5例，女1例，年龄21~76岁（平均56岁）。6例均行MRI检查，增强扫描4例。结果：6例均为单发，躯干和四肢皮下各3例；4例表现为边界清楚的类圆形或椭圆形软组织肿块；2例表现为边界欠清的分叶状或不规则软组织肿块。与肌肉信号相比，T1WI表现为等（n=3）或稍高信号（n=3），T2WI脂肪抑制序列上均表现为略不均匀的高信号，其内可见少许条片状的稍低信号。Gd-DTPA增强扫描病灶均明显强化，4例内部可见不规则弱强化区。结论：隆突性皮肤纤维肉瘤MRI表现有一定的特征；MRI对病灶的术前评估及术后复发的检测有重要的价值。

MRI features of dermatofibrosarcoma protuberans

Objective： To discuss the MRI features of dermatofibrosarcoma protuberans（DFSP）.Methods： MRI features in 6 pathologically confirmed DFSP were analyzed.The 6 patients included 1 female and 5 males,age ranged from 21 to 76 years,with a mean age of 56 years.MR imaging was performed in all the 6 patients,with gadolinium-enhanced scan in four patients.Results： All of the 6 lesions located in subcutaneous region.Three of them located in trunk and 3 in extremities.Four of the 6 tumors demonstrated as round or oval soft tissues with clearly defined margin.One of the 6 tumors appeared as a lobulated mass,and the other one presented as an irregular mass with relatively unclear margin.On T1WI,three tumors were isointense to skeletal muscle,and the other three showed slightly hyperintense to skeletal muscle.On fat-saturation T2WI（T2WI fs）,all of the tumors were slightly heterogenous hyperintense signal,with some strip-like or patchy areas of hypointensity in the masses.After intravenous injection of Gd-DTPA,all the masses enhanced remarkably,4 cases showed various weakly enhanced regions.Conclusion： DFSP had some specific MRI features.MRI plays an important role in the accurate preoperative assessment and detection of tumor recurrence.