title: Short-term outcome of mild isolated antenatal hydronephrosis conservatively managed.
abstract: OBJECTIVE
  To assess the outcome of newborns with mild isolated antenatal hydronephrosis (MIAHN) managed with neither antibiotic prophylaxis nor voiding cystourethrography (VCUG).
  
  
  METHODS
  
  
  
  METHODS
  anterior-posterior pelvic diameter 5-15 mm at third trimester of gestation, confirmed by first postnatal ultrasound.
  
  
  METHODS
  pelvic diameter > 15 mm, calyectasis, hydroureteronephrosis, renal or bladder abnormalities. Clinical and ultrasound follow-up was performed. Parents were familiarized with urinary tract infection (UTI) signs. If UTI was confirmed, VCUG was performed. Hydronephrosis outcome was assessed as intrauterine resolution, total or partial resolution, stability or progression.
  
  
  RESULTS
  MIAHN was detected in 193 newborns (109 unilateral, 84 bilateral; 277 renal units); 23 (12%) had UTI and 2 of them showed low-grade reflux. After a mean follow-up of 15 months, 91 renal units showed intrauterine resolution (33%), 111 (40%) total resolution, 20 (7%) partial resolution, 52 (19%) stability and 3 (1%) progression.
  
  
  CONCLUSIONS
  Total resolution of hydronephrosis was observed in 73% of renal units during the first year. Routine antibiotic prophylaxis and VCUG might not be necessary in all infants with MIAHN, clinical and ultrasound follow-up being advisable during the first year of life.
authors.affiliation: Radiology Department, Hospital Interzonal General de Agudos Dr. José Penna, Lainez y Necochea, Bahía Blanca, Provincia de Buenos Aires, Argentina. mmtombesi@speedy.com.ar
authors.forename: María Marcela
authors.initials: MM
authors.lastname: Tombesi
authors.forename: Laura Fernanda
authors.initials: LF
authors.lastname: Alconcher
mesh_terms: D002675:Child, Preschool; D003937:Diagnosis, Differential; D019468:Disease Management; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006869:Hydronephrosis / Q000000981:diagnostic imaging* / Q000209:etiology / Q000628:therapy; D007223:Infant; D007231:Infant, Newborn; D007668:Kidney / Q000000981:diagnostic imaging*; D007682:Kidney Pelvis / Q000000981:diagnostic imaging*; D008297:Male; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000000981:diagnostic imaging*; D011263:Pregnancy Trimester, Third; D011379:Prognosis; D011446:Prospective Studies; D013997:Time Factors; D016216:Ultrasonography, Prenatal; D014552:Urinary Tract Infections / Q000150:complications / Q000175:diagnosis