title: The mirror image artifact of early pregnancy.
authors.forename: B H
authors.initials: BH
authors.lastname: Lim
authors.forename: M
authors.initials: M
authors.lastname: Amos
authors.forename: A C
authors.initials: AC
authors.lastname: Fairhead
mesh_terms: D000328:Adult; D016477:Artifacts; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011271:Pregnancy, Ectopic / Q000000981:diagnostic imaging*; D016216:Ultrasonography, Prenatal