Ⅰ型和Ⅱ型乳头状肾细胞癌的影像学表现及其差异

摘要

Objective To identify the imaging performance and differences between type] and type Ⅱ papillary renal cell carcinoma (PRCC).Methods Data of 21 lesions of type Ⅰ,27 lesions of type Ⅱ (1 patient had 2 lesions) in 47 patients was retrospectively analyxed.All patients with pathologically proven PRCC were examined by contrast CT or MRI preoperatively.The morphological features,outside invasion signs and performance on contrast-enhanced CT were compared by qualitative and quantitative studies.The maximum diameter of tumors and CT values,△CT values in corticomedullary and nephrographic phase were analyzed by two-sample t-test,classified variable were compared by the Pearson X2 test or the Fisher exact test.Results On morphological behaviors,type Ⅱ PRCC were significantly larger than type Ⅰ PRCC (t =-2.604,P =0.013),more heterogeneous (X2 =14.928,P =0.000),greater probability to show cystic degeneration or necrosis (X2 =5.598,P =0.018) with more severity (X2 =4.769,P =0.029).There was no significant difference in hemorrhage and calcification between the two types observed by contrast-enhanced CT.Respectively,66.7 ％ of type Ⅱ PRCC and 23.8％ of type Ⅰ PRCC had papillary nodule,with obviously significant difference (X2 =8.694,P =0.003).In outside invasion signs,except for margins,type Ⅱ had more easily invaded peripheral fat,renal sinus and distant metastasis compared with type Ⅰ (P＜0.05).On contrast enhanced CT,there were significant differences in CT values and △CT values in corticomedullary phase between the two types (t =-2.674,P =0.012;t =-3.109,P =0.005).And there were no significant difference in unenhanced and nephrographic phase.Conclusions There were certain difference in morphological features,outside invasion signs and enhancement degree between type Ⅰ and type Ⅱ PRCC,and part of type Ⅱ PRCC had aggressive biological behaviors with worse prognosis.%目的 探讨Ⅰ型和Ⅱ型乳头状肾细胞癌(papillary renal cell carcinoma,PRCC)的影像学表现及其差异.方法 回顾性分析经手术病理证实的47例PRCC患者资料,其中Ⅰ型21个病灶,Ⅱ型27个病灶(1例患者左肾含2个病灶).所有患者术前均行肾脏CT或MRI平扫及动态增强检查.对PRCC的形态学特征、肿瘤外侵征象、增强CT表现进行定性和定量分析.采用独立样本t检验对病灶最大径、三期CT值及皮髓交界期△CT、实质期△CT进行比较,采用PearsonX2检验或Fisher确切概率法对分类变量进行比较.结果 一般形态学上,Ⅱ型PRCC平均最大径大于Ⅰ型(t=-2.604,P=0.013),密度/信号更不均匀(X2=14.928,P=0.000),更易出现囊变或坏死(X2=5.598,P=0.018),且程度更明显(X2 =4.769,P =0.029);在CT图像上,两型之间出血和钙化征象的差异均无统计学意义.分别有66.7％Ⅱ型PRCC和23.8％Ⅰ型PRCC出现乳头结节,两型之间的差异有显著统计学意义(X2=8.694,P=0.003).在肿瘤外侵表现方面,除边界征象外,Ⅱ型较Ⅰ型PRCC更易发生肾周脂肪侵犯、肾窦侵犯及转移(P＜0.05).在增强CT表现方面,两型在皮髓交界期CT值、皮髓交界期△CT的差异均有统计学意义(t=-2.674,P=0.012;t=-3.109,P=0.005),而在平扫期CT值、实质期CT值、实质期△CT上的差异均无统计学意义.结论 Ⅰ型和Ⅱ型PRCC在形态学特征、肿瘤外侵征象及强化程度上有一定差异,部分Ⅱ型肿瘤具有侵袭性生物学行为,预后更差.