后肾腺瘤的CT和MRI影像学表现(附11例报告及文献复习)

CT and MRI Findings of Metanephric Adenomas:Report of 11 Cases with Literature Review

目的探讨后肾腺瘤(MA)的临床表现、影像学及病理学特征,提高对MA的认识。方法回顾分析2009年1月至2013年3月间本院经手术后病理证实的MA 11例及文献复习,总结其影像学特征。结果 MA女性多发,单侧发病,肿块多局限于肾实质内,且边界清晰,CT平扫呈等密度或稍高密度,增强后呈渐进性不均匀强化,CTA未见明显供血血管,MRI呈长T1、稍长T2,强化方式亦为渐进性不均匀强化,DWI一般为稍高信号。结论CT和MRI对于MA的诊断有一定帮助,。

Objective To investigate the clinical, imaging and pathological features of metanephric adenomas so as to improve the understanding of this tumor. Methods A total of 11 patients with pathologically-confirmed metanephric ade- noma, who were encountered at authors＇ hospital during the period from January 2009 to March 2013, were enrolled in this study. The clinical data were retrospectively analyzed, the related literatures were reviewed, and the imaging features were summarized. Results Metanephric adenoma occurred predominantly in middle-aged females. Usually the lesion was uni- lateral, well demarcated and located within the renal parenchyma. On plain CT scans, the lesion presented as an isodense or slightly hyperdense mass, which showed progressive inhomogeneous enhancement on dynamic contrast-enhanced CT scans. MRI showed that the lesion was characterized by long T1 and slight long T2 signals and progressive inhomogeneous enhancement. On DWI, the lesion showed slight hyper-intensity signal. Conclusion A full knowledge of CT and MRI features of metanephric adenoma is very helpful in making the diagnosis.