title: Single fetal demise in a twin gestation: umbilical vein thrombosis.
abstract: BACKGROUND
  Single fetal demise in a twin pregnancy is a rare event, the common causes being twin-twin transfusion syndrome, chromosomal or congenital anomalies and abnormalities of the umbilical cord and placenta. Umbilical vein thrombosis is a very rare cause of single fetal demise in twins.
  
  
  METHODS
  Three days after a reassuring biophysical profile, a 40-year-old primigravida with twin pregnancy presented at 38 weeks' gestation in early labor when demise of 1 of the twins was recognized. She underwent a cesarean section for arrest of labor, delivering twin A, a stillborn female weighing 2, 360 g and twin B, a liveborn male weighing 2,200 g. Umbilical vein thrombus was noted in twin A.
  
  
  CONCLUSIONS
  Umbilical vein thrombosis is a rare and sudden cause of fetal demise.
authors.affiliation: Department of Obstetrics and Gynecology, College of Physicians and Surgeons Columbia University, Sloane Hospital for Women at Columbia Presbyterian Medical Center, New York, N.Y., USA. baxilax@cpmc3.cpmc.columbia.edu
authors.forename: L V
authors.initials: LV
authors.lastname: Baxi
authors.forename: A
authors.initials: A
authors.lastname: Daftary
authors.forename: A
authors.initials: A
authors.lastname: Loucopoulos
mesh_terms: D000328:Adult; D002585:Cesarean Section; D004200:Diseases in Twins; D005260:Female; D005313:Fetal Death / Q000209:etiology*; D005865:Gestational Age; D006801:Humans; D008297:Male; D007752:Obstetric Labor, Premature; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular; D011272:Pregnancy, Multiple; D014429:Twins, Dizygotic; D014471:Umbilical Veins; D020246:Venous Thrombosis / Q000150:complications*