肾嗜酸细胞腺瘤CT及MRI表现

Oxyphilic adenoma of kidney:imaging analysis on CT and MR

目的：总结分析肾脏嗜酸细胞腺瘤的影像学表现,提高诊断水平。方法：回顾性分析经手术病理证实的10例肾脏嗜酸细胞腺瘤的临床及影像学资料,并与手术病理进行对比分析。结果：9例为单发肿瘤,1例并发肾透明细胞癌。肿瘤呈圆形或类圆形,直径1.5~5.4 cm,境界清晰,均位于肾皮质区,向肾外突出。CT平扫病灶多呈等密度;平扫T1WI病灶呈等信号或低信号,其中4例中央裂隙状疤痕呈更低信号;T2WI病灶呈等、高信号或低信号,肿瘤内混杂稍高信号,中央疤痕呈裂隙状高信号。动态增强扫描7例明显均匀强化;2例不均匀强化,但肿瘤实质部分强化均匀,中央疤痕大部分无强化,少部分延迟强化;1例皮髓质期扫描呈＂轮辐状＂强化。结论：肾脏嗜酸细胞腺瘤是一种良性肿瘤,位于肾皮质区,可向肾外突出,边界清楚。平扫肿瘤呈等密度或信号,增强扫描肿瘤均匀强化、中央出现星状疤痕以及肿瘤＂轮辐状＂强化内其特征性影像表现。

Objective：The purpose of our study was to evaluate CT and MRI in renal oxyphilic adenoma diagnosis.Methods：Clinical and radiology data of 10 renal oxyphilic adenoma patients were analyzed retrospectively.All the cases were confirmed by pathology.Result：9 cases were simple oxyphilic adenoma and 1 case was accompanied with suprarenal epithelioma.Round or round-like shape,clear boundary,protruding mass,diameter range 1.5~5.4cm isodense on CT scanning and all lesions located in cortex were the characters of the tumor.MR T1WI：iso-or low signal（central star shape scar showed more lower signal in 4 cases）;T2WI：Most of them showed iso-high signal or low signal,some of them showed mixed slightly high signal（central stellate scar showed high signal）.Dynamic enhancement：homogenous enhancement in 7 cases,heterogeneous enhancement in 2 cases.However,parenchyma part showed homogenous enhancement while most central scar no enhancement（a few delayed enhancement）.Only 1 case demonstrated spoke-shape enhancement.Conclusion：Renal oncocytoma is a benign tumor and located in the renal cortex.Clear boundary,isodense or isosignal,homogenous enhancement in parenchyma part,no enhancement or delayed enhancement of central scar or spoke-shape enhancement were the imaging characters.