title: Special forms in twin pregnancy - ACARDIAC TWIN/ Twin reversed arterial perfusion (TRAP) sequence.
abstract: Twin pregnancy generally represents a high-risk pregnancy, but monozygous twin pregnancy is a real challenge for the obstetrician due to the serious complications that may occur during its evolution. A very rare, severe complication of monozygous twin pregnancy, which we recently dealt with in the Obstetrics and Gynecology Department of the University Emergency Hospital Bucharest, was a monochorionic monoamniotic twin pregnancy with acardiac twin (TRAP). One of the fetuses (acardiac twin) presented a rudimentary unfunctional heart or even no heart at all, underdeveloped inferior part of the body and head, being transfused by the other fetus with a normal heart (pumping twin) by one superficial arterio-arterial anastomosis through which blood pumped backwards. The understanding of these cases is mandatory in order to offer maximum survival and heath chances to the viable fetus.
  
  
  BACKGROUND
  RFA = radiofrequency ablation, TRAP = reversed arterial perfusion.
authors.affiliation: Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania ; Obstetrics and Gynecology Department, University Emergency Hospital Bucharest, Romania.
authors.forename: F A
authors.initials: FA
authors.lastname: Anca
authors.affiliation: Obstetrics and Gynecology Department, University Emergency Hospital Bucharest, Romania.
authors.forename: A
authors.initials: A
authors.lastname: Negru
authors.affiliation: Obstetrics and Gynecology Department, University Emergency Hospital Bucharest, Romania.
authors.forename: A E
authors.initials: AE
authors.lastname: Mihart
authors.affiliation: Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania ; Obstetrics and Gynecology Department, University Emergency Hospital Bucharest, Romania.
authors.forename: C
authors.initials: C
authors.lastname: Grigoriu
authors.affiliation: Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania ; Obstetrics and Gynecology Department, University Emergency Hospital Bucharest, Romania.
authors.forename: R E
authors.initials: RE
authors.lastname: Bohîlțea
authors.affiliation: Gynecology Department, "Polizu Hospital", Bucharest, Romania.
authors.forename: A
authors.initials: A
authors.lastname: Șerban
mesh_terms: D000328:Adult; D017115:Catheter Ablation; D005260:Female; D005330:Fetofetal Transfusion; D005333:Fetus / Q000002:abnormalities* / Q000473:pathology; D006801:Humans; D007621:Karyotyping; D010477:Perfusion; D010920:Placenta / Q000002:abnormalities; D011247:Pregnancy; D059285:Pregnancy, Twin; D016216:Ultrasonography, Prenatal
keywords: acardiac twin; monozygous twin pregnancy; pumping twin; radiofrequency ablation (RFA); reversed arterial perfusion (TRAP)