髓质海绵肾的MRI表现

Medullary sponge kidney:MRI characteristics

目的:探讨MRI对髓质海绵肾的诊断价值。方法:回顾性分析9例髓质海绵肾患者的MRI表现,全部病例均行常规T1WI、T2WI及磁共振尿路成像(MRU)扫描,分析患肾的形态、大小及髓质内集合管囊变、小结石的MRI信号特点,并与患者同期CT图像作对比分析。结果:9例髓质海绵肾中3例双肾体积增大且边缘凹凸不平,2例单侧体积增大且边缘光滑,另4例双肾大小、形态正常;肾髓质内集合管呈多发小囊状及条管状扩张,T1WI呈低信号,T2WI呈高信号;5例在小结石较集中的部位T2WI序列可见呈低信号改变的小结石,对小结石稀少的部位T2WI序列显示不清,所有髓质海绵肾小结石在T1WI序列上均无法显示;1例患者同时合并先天性肝内胆管扩张及双侧肾盂结石。结论:MRI对髓质海绵肾的诊断具有重要价值,可清晰显示髓质集合管的囊变情况,但对结石显示较差。

Objective：To explore the diagnostic value of MRI in medullary sponge kidney（MSK）.Methods：All nine MSK patients were performed routine T1WI,T2WI and MRU scan.Compared with CT features,the MR characteristics of the renal size,morphology,dilated collecting tubules and small stones were analyzed retrospectively.Results：Bilateral kidney enlargement and uneven borders were observed in 3 of 9 patients.Unilateral kidney enlargement and smooth borders were observed in 2 patients,while other 4 patients appear normal.Multiple small cystic or tubular dilatation of collecting tubules in renal medulla appeared as hypointensity on T1WI and hyperintensity on T2WI.Small stones were observed as low T2WI signal in 5 patients.However,scattered microliths couldn’t be found on T2WI and T1WI.One case combined with Caroli’s disease and bilateral pelvis calculus.Conclusion：MRI is an effective method for depicting MSK,and it can show cystic dilatation of collecting tubules clearly.But it can not show clearly small stones in medulla.