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目的:探讨肾嗜酸细胞瘤(RO)的影像学表现,以提高对其诊断的准确性。方法:回顾性分析经病理证实的12例RO患者的影像资料。12例均行MSCT平扫及多期增强扫描,包括肾皮质期、髓质期和排泄期(5例)增强扫描;有3例同时行MRI检查。结果:CT平扫示12例病灶均为单发,7例位于左肾,5例位于右肾,最大径2.0~11.6cm,平均5.8cm,<3.0cm者3例。增强扫描:肾皮质期示10例病灶明显强化,其中8例强化低于肾皮质,2例强化接近于肾皮质;肾髓质期示7例病灶强化程度下降并低于肾脏髓质的密度,3例病灶持续强化、于排泄期见密度开始下降,2例病灶在皮质期~排泄期表现为持续强化;6例病灶内可见星芒样瘢痕,8例有完整包膜,3例可见钙化。3例病灶于MRIT1WI上呈等、低信号,T2WI呈相对均匀的高信号,3例均见完整包膜。结论:RO的影像学表现有一定特征性,多表现为增强后均匀强化,无囊变或坏死,T2WI上可见完整的低信号包膜,有助于同各类型肾癌鉴别。
Objective: To investigate the imaging manifestations of renal oncocytoma (RO) in order to improve its diagnostic accuracy. Methods: The imaging data of 12 patients with pathologically confirmed RO were retrospectively analyzed. All 12 cases underwent MSCT scan and multi-phase enhanced scan including enhanced renal cortical phase, medullary phase and excretory phase (5 cases). MRI was also performed in 3 cases. Results: All the 12 lesions were solitary with CT scan, 7 were located in the left kidney, 5 were located in the right kidney, and the largest diameter was 2.0 ~ 11.6cm, with an average of 5.8cm and <3.0cm. Enhanced scan: renal cortical lesions showed 10 cases were significantly enhanced, of which 8 cases of enhanced lower than the renal cortex, 2 cases strengthened close to the renal cortex; renal medulla showed 7 cases of lesion enhancement and lower than the density of the renal medulla, 3 cases continued to strengthen the lesion, the density began to decline in the excretory period, 2 lesions in the cortical period to excretion showed continued enhancement; 6 cases of lesions can be seen Star-like scar, 8 cases have a complete capsule, 3 cases of calcification. Three lesions showed equal and low signal on MRIT1WI, while T2WI showed relatively high signal. All of the three cases showed complete capsule. CONCLUSIONS: The imaging features of RO have some characteristic features, such as enhanced uniform enhancement, no cystic degeneration or necrosis, and complete low signal envelope on T2WI, which is helpful for the identification of various types of renal cell carcinoma.