title: First trimester conceptus.
authors.forename: A F
authors.initials: AF
authors.lastname: Tarantal
authors.forename: A G
authors.initials: AG
authors.lastname: Hendrickx
authors.forename: R
authors.initials: R
authors.lastname: O'Rahilly
mesh_terms: D000818:Animals; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008202:Lymphangioma / Q000175:diagnosis; D008252:Macaca fascicularis; D008577:Meningeal Neoplasms / Q000175:diagnosis; D008578:Meninges / Q000196:embryology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal / Q000379:methods*