title: Atypical hatching of a human blastocyst leading to monozygotic twinning: a case report.
abstract: OBJECTIVE
  To report a case of monozygotic twinning after atypical hatching of a human blastocyst.
  
  
  METHODS
  Case report.
  
  
  METHODS
  University-based IVF program.
  
  
  METHODS
  A 33-year-old woman with tubal sterility.
  
  
  METHODS
  Embryo transfer of a human blastocyst with atypical hatching.
  
  
  METHODS
  Development to the blastocyst stage, hatching process, follow-up of pregnancy.
  
  
  RESULTS
  Development of a monozygotic dichorial pregnancy.
  
  
  CONCLUSIONS
  First report of an atypical hatching of a human blastocyst leading to dichorial monozygotic twinning.
authors.affiliation: Department of Gynecology, In Vitro Fertilization Unit, Catholic University of Louvain, Cliniques Universitaires St. Luc, Brussels, Belgium.
authors.forename: A
authors.initials: A
authors.lastname: Van Langendonckt
authors.forename: C
authors.initials: C
authors.lastname: Wyns
authors.forename: P A
authors.initials: PA
authors.lastname: Godin
authors.forename: D
authors.initials: D
authors.lastname: Toussaint-Demylle
authors.forename: J
authors.initials: J
authors.lastname: Donnez
mesh_terms: D000328:Adult; D001755:Blastocyst / Q000502:physiology*; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014430:Twins, Monozygotic; D016216:Ultrasonography, Prenatal