后肾腺瘤的CT诊断

CT diagnosis of metanephric adenoma

目的:探讨后肾腺瘤的CT表现。方法:回顾性分析3例经病理证实的后肾腺瘤CT表现并复习文献。结果:3例后肾腺瘤患者均为男性,均为单侧发病,其中2例CT平扫分别表现为稍低密度和稍高密度,边界清晰,密度均匀,增强扫描轻度强化,并有延迟强化;1例平扫为等低混杂密度团块,伴有点片状钙化及囊变,增强扫描实性部分明显强化。结论:后肾腺瘤非常少见,CT表现有一定特点,多表现为肾皮质实性占位,增强扫描轻中度强化,并有延迟强化;正确认识并考虑到其可能,有助于与肾癌鉴别,指导手术方案的制订,避免不必要的全肾切除术。

Objective：To discuss the CT manifestations of metanephric adenoma（MA） of the kidney.Methods：The CT manifestations of 3 cases with pathology proved metanephric adenoma were retrospectively analyzed and the literatures were reviewed.Results：Three patients with MA were all males and had unilateral kidney involved.Slightly hypo-and hyper-attenuated with well-defined and homogeneous density mass was showed in 2 patients＇ plain CT scans respectively,slight as well as delayed enhancement were assessed after contrast administration.One patient showed heterogeneous mass with iso-/hypo density,calcification and cystic change on plain scan as well as marked and heterogeneous enhancement in the solid part of the mass after contrast.Conclusion：MA is a very rare tumor,certain characteristic CT manifestations could be shown,mostly manifested as a solid mass located in renal cortex with mild to moderate as well as delayed enhancement after contrast.Understanding of the above-mentioned information is helpful in the differential diagnosis from renal cell carcinoma and operation guidance,so as to avoid unnecessary nephrectomy.