title: Reply.
authors.affiliation: Department of Obstetrics and Gynecology, Washington University in St Louis, St Louis, MO. Electronic address: theilenl@wudosis.wustl.edu.
authors.forename: Lauren H
authors.initials: LH
authors.lastname: Theilen
authors.affiliation: Mallinckrodt Institute of Radiology, Washington University in St Louis, St Louis, MO.
authors.forename: Vincent M
authors.initials: VM
authors.lastname: Mellnick
authors.affiliation: Department of Obstetrics and Gynecology, Washington University in St Louis, St Louis, MO.
authors.forename: Alison G
authors.initials: AG
authors.lastname: Cahill
mesh_terms: D001064:Appendicitis / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*