Evaluation of hydronephrosis and hydroureterosis in infants by magnetic resonance urography(analysis of 214 cases)

Objective To evaluate diagnostic value of hydronephrosis and hydroueterosis in infants with magnetic resonance urography(MRU).Methods 214 cases of infants(3 years old or younger) suspected urinary tract obstruction underwent the routine MRI and MRU examination.Results In all cases,the location and degree of hydronephrosis and uretal dilation were clearly showed.Obstruction was located at conjunction of renal pelvis and ureter in 109 cases,at mid-part of ureter in 5 cases,and at ureterovesical orifice in 100 cases.In combination of routine T2WI,congenital urinary system malformation was also demonstrated.These abnormalities were included as the double renal pelvis and double ureter in 23 cases,ureterocele in 13 cases,renal dysplasia in 7 cases,ectopic ureteral orifice in 6 cases,horseshoe kidney in 4 cases,megaureter 3 cases,renal agenesis 2 cases,and ectopic kidney 2 cases respectively.Conclusion With the advantages of no X-ray ionizing radiation,no invasion,no needing contrast medium and high soft tissue resolution,MRU is one of best methods for detecting the urinary tract obstruction of infants.