title: Accuracy of prenatal diagnosis of renal agenesis with color flow imaging in severe second-trimester oligohydramnios.
abstract: OBJECTIVE
  Our purpose was to examine the potential of color flow imaging to assess the presence of renal arteries in second-trimester pregnancies complicated by severe oligohydramnios.
  
  
  METHODS
  Thirty-three consecutive second-trimester pregnancies referred with severe oligohydramnios were prospectively studied with high-resolution color Doppler ultrasonography to establish the presence or absence of renal arteries. Prenatal findings were correlated with the presence or absence of fetal kidneys at postmortem or postnatal examination.
  
  
  RESULTS
  Neither renal artery was visualized in eight fetuses; postmortem examination confirmed bilateral renal agenesis in seven and unilateral renal agenesis with a contralateral atrophic multicystic kidney in the other. Only one renal artery was seen in three; postmortem examination demonstrated unilateral renal agenesis in two fetuses and bilateral multicystic dysplastic kidneys in the other. Postmortem or postnatal evaluation confirmed the presence of both kidneys in all 22 fetuses in which both renal arteries were identified prenatally.
  
  
  CONCLUSIONS
  Color Doppler ultrasonography is useful in the prenatal evaluation of fetuses with severe second-trimester oligohydramnios to demonstrate the presence or absence of renal arteries. This technique should be added to the armamentarium of prenatal tests to evaluate second-trimester fetuses with severe oligohydramnios.
authors.affiliation: Centre for Fetal Care, Royal Postgraduate Medical School, London, United Kingdom.
authors.forename: W
authors.initials: W
authors.lastname: Sepulveda
authors.forename: K D
authors.initials: KD
authors.lastname: Stagiannis
authors.forename: N J
authors.initials: NJ
authors.lastname: Flack
authors.forename: N M
authors.initials: NM
authors.lastname: Fisk
mesh_terms: D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D007668:Kidney / Q000002:abnormalities* / Q000000981:diagnostic imaging; D016104:Oligohydramnios; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011446:Prospective Studies; D012077:Renal Artery / Q000000981:diagnostic imaging; D018615:Ultrasonography, Doppler, Color