肾嗜酸细胞腺瘤的CT征象分析

Analysis of CT Signs of Renal Oncocytoma

目的探讨肾嗜酸细胞腺瘤(RO)的CT特征。方法回顾性分析本院经手术病理证实为RO且术前进行肾脏CT平扫及增强扫描的31例患者的影像资料,观察每个病灶的影像学特征,包括病变部位、包膜、瘢痕、强化方式等。结果纳入的31个RO病例中,12个病灶位于左肾,19个病灶位于右肾,病灶最大直径1.6cm~9.1cm,平均直径(3.7±1.9)cm。23个(23/31)表现为外生性生长,22个(22/31)出现纤维包膜,17个(17/31)出现纤维瘢痕,2个(2/31)出现钙化,16个(16/31)出现辐轮状强化,23个(23/31)表现为皮质期中度以上强化,30个(30/31)肿瘤实性部分皮质期不均匀强化,20个(20/31)病灶在实质期和延迟期强化表现均匀,强化程度明显弱于相同层面肾脏正常组织。结论CT诊断肾嗜酸细胞腺瘤可根据肿瘤的瘢痕、包膜及强化方式等为依据,有助于区分于其他肾脏肿瘤做出鉴别诊断。

Objective To investigate the CT features of renal oncocytoma(RO).Methods Retrospective analyse 31 cases of patients who were surgically and pathologically confirmed RO and received the preoperative CT scan and enhanced scan of the kidney.Observed characteristics of each lesion,including the location,capsule,scar,strengthening,etc.Results 31 RO lesions,12 in the left kidney and 19 in the right kidney,the maximum diameter of the tumor was 1.6cm~9.1cm,with an average of(3.7±1.9)cm.23(23/31)showed exogenous growth,22(22/31)showed fibrous capsule,17(17/31)showed fibrous scar,and 2(2/31)showed calcification.16(16/31)showed spoke-like enhancement,23(23/31)showed moderate enhancement above cortical phase,and 30(30/31)tumors showed uneven enhancement of cortical phase.20(20/31)parenchymal and delayed tumor enhancements were uniform,and the degree of enhancement was significantly lower than that of the same layer of kidney.Conclusion CT findings of renal oncocytoma have certain characteristics,and the scar,capsule and enhancement mode of the tumor provide the basis for diagnosis of oncocytoma.