Berg, C First trimester twin-to-twin transfusion syndrome in a trichorionic quadruplet pregnancy--a diagnostic challenge. [electronic resource] - Fetal diagnosis and therapy - 357-61 p. digital Publication Type: Case Reports; Journal Article ISSN: 1015-3837 Standard No.: 10.1159/000065385 doi Subjects--Topical Terms: Blood Flow VelocityFemaleFetofetal Transfusion--diagnostic imagingHumansMalePregnancyPregnancy Trimester, FirstQuadrupletsUltrasonography, PrenatalUmbilical Arteries--diagnostic imagingUmbilical Veins--diagnostic imaging