A Lexicon for First-Trimester US: Society of Radiologists in Ultrasound Consensus Conference Recommendations.

The Society of Radiologists in Ultrasound convened a multisociety panel to develop a first-trimester US lexicon based on scientific evidence, societal guidelines, and expert consensus that would be appropriate for imagers, clinicians, and patients. Through a modified Delphi process with consensus of at least 80%, agreement was reached for preferred terms, synonyms, and terms to avoid. An intrauterine pregnancy (IUP) is defined as a pregnancy implanted in a normal location within the uterus. In contrast, an ectopic pregnancy (EP) is any pregnancy implanted in an abnormal location, whether extrauterine or intrauterine, thus categorizing cesarean scar implantations as EPs. The term pregnancy of unknown location is used in the setting of a pregnant patient without evidence of a definite or probable IUP or EP at transvaginal US. Since cardiac development is a gradual process and cardiac chambers are not fully formed in the first trimester, the term cardiac activity is recommended in lieu of 'heart motion' or 'heartbeat.' The terms 'living' and 'viable' should also be avoided in the first trimester. 'Pregnancy failure' is replaced by early pregnancy loss (EPL). When paired with various modifiers, EPL is used to describe a pregnancy in the first trimester that may or will not progress, is in the process of expulsion, or has either incompletely or completely passed.

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Déclaration de conflit d'intérêts

Disclosures of conflicts of interest S.K.R. Book royalties from Elsevier. M.M.H. Payment for lectures, travel, or visiting professorship from Massachusetts General Hospital/Brigham Women’s Hospital, University of Toronto, McMaster University, World Class CME, and Hoag Medical Group; section editor for RadioGraphics. P.M.D. No relevant relationships. M.C.F. Payment for panel discussion from GE HealthCare. A. Kennedy Royalties and writer’s fees from Elsevier; honoraria from World Class CME and University of California Davis; support for travel from the RSNA; secretary of the Society of Radiologists in Ultrasound. R.A. No relevant relationships. K.B. Patents planned, issued, or pending with Kristyn Brandi MD MPH LLC. L.D. No relevant relationships. S.K.H. Grants from the National Center for Advancing Translational Sciences at the National Institutes of Health; payment for presentations from Organon; payment for expert testimony from Huff Powell Bailey; support for attending meeting from the American College of Obstetricians and Gynecologists (ACOG); section secretary of the Pennsylvania ACOG. A. Kamaya Book royalties from Elsevier. A. Koyama No relevant relationships. P.C.L. Honoraria for editor role from RoshReview (now Blueprint); support to attend meeting from Individuals with Intellectual or Development Disability Engaged, Aligned and Leading project workgroup funded by the Patient-Centered Outcomes Research Institute; secretary-treasurer of the New York Chapter of the American College of Emergency Physicians and past chair of the American College of Emergency Physicians Emergency Ultrasound Section. K.E.M. No relevant relationships. T.M. Book royalties from Elsevier. S.G.O. No relevant relationships. K.O. No relevant relationships. R.S. Honoraria and support for travel to meetings from World Class CME. S.S. Grants from the National Institutes of Health, AbbVie, and Organon. L.M.S. No relevant relationships.