title: Early second-trimester diagnosis of sirenomelia.
abstract: Two cases of sirenomelia are described, detected in the 14th and 16th weeks of gestation by transvaginal ultrasonography. A hypothesis for the aetiology of sirenomelia and its associated anomalies is discussed.
authors.affiliation: Department of Obstetrics and Gynecology, Free University Hospital, Amsterdam, The Netherlands.
authors.forename: M M
authors.initials: MM
authors.lastname: van Zalen-Sprock
authors.forename: J M
authors.initials: JM
authors.lastname: van Vugt
authors.forename: J J
authors.initials: JJ
authors.lastname: van der Harten
authors.forename: H P
authors.initials: HP
authors.lastname: van Geijn
mesh_terms: D000328:Adult; D004480:Ectromelia / Q000000981:diagnostic imaging*; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D016216:Ultrasonography, Prenatal