Imaging Diagnosis of Duplication of Renal Pelvis and Ureter

Objective:To study the manifestations of renal pelvis and ureter duplication abnormality on MRI,MRU,CT and IVU imaging,and to investigate the value of different imaging examinations.Methods:In 13 cases of renal pelvis and ureter duplication abnormality proved by operation and pathology,the images of MRI,MRU,CT and IVU were analyzed retrospectively.13 cases all underwent MRI,MRU and IVU examinations,in addition,4 cases with retrograde urography,and 5 cases with CT scan.Results:13 cases by MRI and MRU could all be diagnosed.Diagnosis accuracy rate was 84.6%;4 cases were clearly displayed with duplication abnormality by IVU;2 cases could also be diagnosed with delayed urography imaging;6 cases couldn't be diagnosed without urography imaging.Diagnosis accuracy rate was 46.2%;in the 4 cases of retrograde urography,2 case showed the images and 2 cases didn't due to failure of intubation.Diagnosis accuracy rate was 50%; 4 cases were definitely diagnosed with CT scan,1 case of upper renal pelvis dilation was misdiagnosed as cystis diagnosis accuracy rate was 80%.Conclusion:Renal pelvis and ureter duplication abnormality are diverse in type.The pathology and images vary with whether there are complications.There exist advantages and disadvantages in each imaging inspection,IVU and CT are suitable for cases without complications and with normal function of the kidney.MRI is preferable to unhealthy kidneys.Retrograde urography is considered only when other image inspections are unavailable for diagnosis.