History:A59-year-oldmaninitiallypresentedtoanoutsidehospitalwithrightflankpainandgrosshematuriaduetoapartiallyobstructingrightureteralcalculus.
病史：59岁男性，最初因右输尿管结石导致右腹痛、肉眼血尿在外院就诊。
Findings
CoronalCTimage(a)demonstratesawell-circumscribedhomogeneousfat-attenuatingintravascularmass(arrows)extendingfromtherenalveinstotheinferiorvenacava(IVC).AxialT2MRimage(b)showsahyperintenseroundmassintheIVCthatsubtractsoutonpostcontrastT1fat-saturatedaxial(c)andcoronal(d)MRimages,aswellasdemonstrateschemicalshiftartifactonout-of-phasecoronalMRI(e).Thelesionisspacefilling,nonenhancingandnearlyallfat,most
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