title: Prenatal sonographic diagnosis of conjoined twins in the first trimester: two case reports.
abstract: Conjoined twins are a rare occurrence. We present two cases of conjoined twins diagnosed by ultrasound examination at 8 and 13 weeks' gestation, respectively. These cases demonstrated the possibility of making an accurate diagnosis of conjoined twins and delineating the extent of organ sharing in the first trimester.
authors.affiliation: Department of Obstetrics and Gynecology, University of Hong Kong, Tsan Yuk Hospital.
authors.forename: Y H
authors.initials: YH
authors.lastname: Lam
authors.forename: S Y
authors.initials: SY
authors.lastname: Sin
authors.forename: C
authors.initials: C
authors.lastname: Lam
authors.forename: C P
authors.initials: CP
authors.lastname: Lee
authors.forename: M H
authors.initials: MH
authors.lastname: Tang
authors.forename: H Y
authors.initials: HY
authors.lastname: Tse
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014428:Twins, Conjoined; D016216:Ultrasonography, Prenatal