腹盆部孤立性纤维瘤的影像学表现

目的探讨腹盆部孤立性纤维瘤(SFT)的CT及MRI特点,提高对该病的认识。方法回顾性分析14例经手术病理证实的腹盆部SFT的CT及MRI平扫及增强表现,并与病理对照。结果 14例SFT中,肝脏2例,胰腺1例,腹壁2例,腹腔内4例,盆腔5例。肿物边界清楚10例,不清4例。11例行CT扫描,9例密度不均匀,2例密度均匀,8例多期增强扫描均于门脉期强化达峰值并持续性强化或缓慢下降。3例MRI检查均信号不均匀,T_1WI等信号1例,稍低信号2例,T_2WI稍高信号2例,稍低信号1例,增强扫描均见持续强化。SFT的相对特征性表现为腹部及盆腔孤立性肿块,边界清楚,见明显坏死囊变,T_2 WI上病灶内见低信号影,增强扫描实性部分明显强化,呈持续性或延迟强化。结论腹盆部SFT影像学表现多种多样,具有一定的特征性,确诊仍需病理学及免疫组织化学检查。

CT and MRI of solitary fibrous tumor in the abdomen and pelvis with pathologic correlation

Objective To analyze the CT and MRI features of solitary fibrous tumor（SFT）of the abdomen and pelvis. Methods Unenhanced and contrast-enhanced CT and MRI of 14 patients with histologically confirmed SFT of the abdomen and pelvis were retrospectively analyzed and correlated with pathologic features.Results The 14 tumors were located in the liver（2）,pancreas （1）,abdominal wall（2）,abdomen（4）and pelvis（5）with ill-defined（10）or well-defined（4）tumor margins.Of 11 patients,the CT densities of the tumors were heterogeneous in 9 and homogeneous in 2.In all 8 patients who underwent multiple-phase contrast-enhanced CT,tumor enhancement was maximal in the portal phase with persistent enhancement or slow washout on delayed imaging. Of 3 patients with MRI examinations,the tumors were isointense（1）or slightly hypointense（2）on T1-,slightly hyperintense（2） or slightly hypointense on T2-weighted images with persistent enhancement pattern.Conclusion SFT of the abdomen and pelvis has CT and MRI characteristics of well-defined solitary mass with necrosis,low T2 signal intensity,intense and persistent delayed enhancement of the solid portion.