title: Monochorionic twinning: sonographic assessment.
authors.affiliation: Department of Diagnostic Ultrasound (L-374), University of California Medical Center, San Francisco 94143-0628.
authors.forename: R A
authors.initials: RA
authors.lastname: Filly
authors.forename: R B
authors.initials: RB
authors.lastname: Goldstein
authors.forename: P W
authors.initials: PW
authors.lastname: Callen
mesh_terms: D002823:Chorion; D004200:Diseases in Twins / Q000175:diagnosis / Q000196:embryology*; D005260:Female; D005330:Fetofetal Transfusion / Q000175:diagnosis / Q000196:embryology; D006330:Heart Defects, Congenital / Q000175:diagnosis / Q000196:embryology; D006801:Humans; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014427:Twins; D014428:Twins, Conjoined / Q000196:embryology; D014430:Twins, Monozygotic; D014463:Ultrasonography