Objective To improve the diagnostic level of metanephric adenoma (MA). Meth-ods Clinical data of 1 case of MA was analyzed retrospectively.The patient underwent CT examina-tion and was diagnosed as chromophobe renal cell carcinoma,then underwent laparoscopic partial ne-phrectomy.The final pathological findings were in accordance with MA. Results CT confirmed the presence of a solid mass in the lower pole of the left kidney.On unenhanced CT scan the mass was poorly-defined.The density of the mass was heterogeneous and slightly lower than that of the adja-cent normal renal parenchyma.The mass was characterized by a small sheet of necrotic area with low density and multiple small nodules of calcification with high density in its interior.On contrast-en-hanced CT scan,the mass showed a pattern of obviously heterogeneous enhancement and during the dual-phase contrast-enhanced CT scan the enhancement was slow and prolonged.The degree of en-hancement was significantly lower than that of adj acent normal renal parenchyma.The final patho-logical findings were in accordance with MA.The patient recovered well,and there was no recur-rence after 8 months of follow-up. Conclusions MA is an extremely rare and benign renal neo-plasm originating in the epithelial cells of the kidney.The CT imaging features of MA have certain specificity,but it is hard to differentiate MA from other hypovascular renal tumors,especially of chromophobe renal cell carcinoma and papillary renal cell carcinoma.Accurate diagnosis is important for selecting the most appropriate clinical treatment strategy.Preoperative or intraoperative patholog-ical examination may be recommended for the diagnosis of MA.%目的提高对后肾腺瘤的影像诊断水平。方法回顾性分析1例后肾腺瘤患者的临床资料，术前CT检查诊断为左肾嫌色细胞癌，行腹腔镜下左肾部分切除术，术后病理确诊为后肾腺瘤。结果 CT提示左肾下极实性肿物，平扫期肿物边界不清，内部密度不均，稍低于邻近肾实质密度，伴有坏死灶和点状钙化，增强扫描肿块呈不均匀轻度强化，双期增强扫描呈渐进性强化，强化程度始终明显低于邻近正常肾实质。术后病理确诊为后肾腺瘤。术后患者恢复良好，随访8个月，未见肿瘤复发。结论后肾腺瘤是罕见的肾上皮源性肿瘤，其CT影像表现有一定特异性，但与其他乏血供肾肿瘤难以鉴别，特别是肾嫌色细胞癌和乳头状肾细胞癌。术前的准确诊断对选择合适的临床治疗策略十分重要，可行术前或术中的病理检查鉴别。
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