title: Changes in echogenicity in the fetal brain: a prevalence study in fetuses at risk for preterm delivery.
abstract: OBJECTIVE
  To study the incidence of echodensities in the periventricular white matter, ventricular system, basal ganglia and thalamus of the brain in fetuses at risk for preterm delivery.
  
  
  METHODS
  This was a prospective study of 124 fetuses with a gestational age between 26 and 34 weeks in pregnancies affected by either pregnancy-induced hypertensive disorders or preterm labor. Transvaginal ultrasound examination of the fetal brain in coronal and sagittal planes was performed weekly until delivery and the neonatal brain was examined within 24 h after delivery.
  
  
  RESULTS
  In 66% of all fetuses, echodensities were found in one or more areas of the brain. They were present in the periventricular area in 52% of cases, the intraventricular area in 18% and in the basal ganglia and thalamus area in 28%. Changes in echogenicity were seen throughout the entire gestational-age period studied. Of the periventricular echodensities that exceeded in echodensity that of the choroid plexus, at least 50% persisted after delivery; at least 38% of the intraventricular echodensities and at least 32% of the basal ganglia and thalamus echodensities persisted after delivery.
  
  
  CONCLUSIONS
  In high-risk fetuses, echodensities are a frequent finding in several areas in the brain. How far these echodensities are related to future outcome of the infant needs to be investigated.
authors.affiliation: Institute of Fundamental and Clinical Human Movement Sciences, Department of Obstetrics and Gynaecology, VU University Medical Centre, Amsterdam, The Netherlands.
authors.forename: F M F
authors.initials: FM
authors.lastname: Rosier-van Dunné
authors.forename: G
authors.initials: G
authors.lastname: van Wezel-Meijler
authors.forename: H J
authors.initials: HJ
authors.lastname: Odendaal
authors.forename: H P
authors.initials: HP
authors.lastname: van Geijn
authors.forename: J I P
authors.initials: JI
authors.lastname: de Vries
mesh_terms: D001921:Brain / Q000196:embryology; D002552:Cerebral Ventricles / Q000000981:diagnostic imaging* / Q000196:embryology; D005260:Female; D005865:Gestational Age; D006801:Humans; D046110:Hypertension, Pregnancy-Induced; D007231:Infant, Newborn; D007234:Infant, Premature; D011247:Pregnancy; D047928:Premature Birth / Q000000981:diagnostic imaging*; D011446:Prospective Studies; D012307:Risk Factors; D016216:Ultrasonography, Prenatal