title: Prenatally diagnosed unilateral renal pelvic dilatation: a dynamic condition on ultrasound and diuretic renography.
abstract: OBJECTIVE
  Imaging characteristics obtained from serial scintigraphic and ultrasonographic studies in children with the prenatal diagnosis of unilateral pelvic dilatation are presented.
  
  
  METHODS
  Serial ultrasonographic and scintigraphic findings in 101 children with unilateral pelvic dilatation collected during followup were reviewed. Changes in hydronephrotic kidney in terms of renal pelvis diameter, kidney size, differential renal function and drainage were noted. A total of 42 children underwent surgery at a mean age of 15.6 months (range 3.1 to 69.2, median 8.2), while 59 were treated nonsurgically.
  
  
  RESULTS
  Mean age at presentation was 5.6 months (range 0.8 to 36.4, median 3.5). Mean followup was 35.5 months (range 6.4 to 78.4, median 29.6). Differential renal function remained stable (46.4% vs 47.3%) but improved drainage (68.4% vs 81.2%) and decreased renal pelvis size (22.2 vs 18.3 mm) was noted in the 2 groups. With age drainage function improved, especially between the younger than 12-month and 12-month or older groups. The mean affected-to-unaffected kidney length ratio at presentation was significantly greater than the ratio at the final followup (paired t test p <0.05).
  
  
  CONCLUSIONS
  In this retrospective review drainage function was prolonged in infants. During followup drainage, dilatation and relative renal size improved in the surgery and nonsurgery groups. There was no change in renal function in either groups during followup. These data support the benign nature of prenatal unilateral hydronephrosis.
authors.affiliation: Medical School of Ege University, Izmir, Turkey.
authors.forename: Z
authors.initials: Z
authors.lastname: Ozcan
authors.forename: P J
authors.initials: PJ
authors.lastname: Anderson
authors.forename: I
authors.initials: I
authors.lastname: Gordon
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D004108:Dilatation, Pathologic / Q000151:congenital; D004322:Drainage; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006869:Hydronephrosis / Q000151:congenital* / Q000175:diagnosis / Q000601:surgery; D007223:Infant; D007231:Infant, Newborn; D007677:Kidney Function Tests; D007682:Kidney Pelvis / Q000002:abnormalities* / Q000473:pathology / Q000601:surgery; D008297:Male; D010043:Outcome and Process Assessment, Health Care; D011247:Pregnancy; D011866:Radioisotope Renography; D012189:Retrospective Studies; D017263:Technetium Tc 99m Mertiatide; D016216:Ultrasonography, Prenatal
chemical_list: D017263:Technetium Tc 99m Mertiatide