title: Intertwin estimated fetal weight or crown rump length discordance and adverse perinatal outcome.
abstract: OBJECTIVE
  In the current review study, we present recent data regarding the importance of intertwin estimated fetal weight (EFW) and crown rump length (CRL) discordance for the prediction of adverse perinatal outcome both in monochorionic and in dichorionic diamniotic gestations.
  
  
  RESULTS
  Twins with significant weight disparity are associated with higher rates of perinatal morbidity and mortality, regardless of gestational age at delivery. However, there is no agreement regarding as to the cut off value above which the perinatal outcome is unfavorably affected and the threshold range from 10 to 30%. On the other hand, CRL discrepancy has proved to be a weak predictor of adverse outcomes, such as fetal or neonatal death in fetuses without chromosomal and structural abnormalities. In clinical practice, decisions about obstetric surveillance of discordant twin gestations, frequency of fetal sonographic monitoring and time of delivery are usually based on amniotic fluid volume and Doppler assessments on a weekly basis.
  
  
  CONCLUSIONS
  Significant EFW discordance leads to adverse perinatal outcome, although the cut-off value has not yet been estimated. CRL discrepancy is not correlated well with adverse perinatal outcome. However, increased monitoring of women with EFW and CRL discrepancy is suggested.
authors.forename: Apostolos
authors.initials: A
authors.lastname: Kaponis
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Thanatsis
authors.forename: Vassilis
authors.initials: V
authors.lastname: Papadopoulos
authors.forename: George
authors.initials: G
authors.lastname: Decavalas
mesh_terms: D002823:Chorion / Q000473:pathology / Q000503:physiopathology; D018568:Crown-Rump Length; D004200:Diseases in Twins / Q000000981:diagnostic imaging / Q000209:etiology; D005260:Female; D005317:Fetal Growth Retardation / Q000000981:diagnostic imaging / Q000209:etiology; D020567:Fetal Weight; D006801:Humans; D007231:Infant, Newborn; D010920:Placenta / Q000098:blood supply; D011247:Pregnancy; D011256:Pregnancy Outcome; D059285:Pregnancy, Twin; D016216:Ultrasonography, Prenatal