The diagnosis value of MSCTU in child congenital anomalies of urinary system

Objective To explore the best diagnostic scanning and image processing methods of multi-slice CT urography (MSCTU) in the detection of congenital anomalies of urinary system.Methods One hundred and fifty nine patients who suffered from the ureter and renal collecting duct system anomalies to be examined by MSCTU were collected and reviewed retrospectively.The diagnostic accuracy of congenital anomalies were calculated on the image of multi-planar reconstruction (MPR) + MSCTU unenhanced scanning and the image of post-processing technique of MPR,maximum intensity projection (MIP),volume rendering (VR) + enhanced cortical phase scanning,parenchymal phase scanning and excretory phase scanning.Results The diagnostic accuracy of the MSCTU unenhanced scanning + MPR and enhanced cortical phase scanning,parenchymal phase scanning,excretory phase scanning + the image of post-processing technique (MPR,MIP,VR) were:ureteropelvic junction obstruction (63.5 ％,79.4％,87.3％,95.2％),renal pelvis ureteral duplication (17.54％,29.82％,29.82％,92.98％),ureteral cyst (73.33％,73.33％,73.33％,100％),extrarenal pelvis (66.67％,66.67％,66.67％,83.33％).MSCTU plain film could show the stones in the urinary system.The MPR film of MSCTU enhanced excretory phase could show the ectopic ureter and ureteral cyst,and the MIP and VR images could visually show the whole structure of urinary system.Conclusions The MSCTU plain film in the diagnosis of congenital malformations of urinary system is of limited values,while the MSCTU film with image post-processing techniques in the diagnosis of congenital malformations of urinary system has their unique advantages,which can be used as a preferred method in examination. Key words: Ureteral diseases;  Urography;  Tomography, spiral computed;  Image processing, computer-assisted