{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T15:30:47Z","timestamp":1782833447720,"version":"3.54.5"},"reference-count":19,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2018,2,5]],"date-time":"2018-02-05T00:00:00Z","timestamp":1517788800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"National Institutes of Health (NIH) T32 training grant","award":["5T32HD055172-07"],"award-info":[{"award-number":["5T32HD055172-07"]}]},{"name":"NIH National Center for Advancing Translational Sciences (NCATS), components of the NIH, and the NIH Roadmap for Medical Research","award":["UL1 TR000448"],"award-info":[{"award-number":["UL1 TR000448"]}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Ultrasound Medicine"],"published-print":{"date-parts":[[2018,8]]},"abstract":"<jats:sec><jats:title>Objectives<\/jats:title><jats:p>To identify the incidence and resolution rates of a low\u2010lying placenta or placenta previa and to assess the optimal time to perform follow\u2010up ultrasonography (US) to assess for resolution.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We conducted a retrospective cohort study of women with a diagnosis of a low\u2010lying placenta or placenta previa at routine anatomic screening. Follow\u2010up US examinations were reviewed to estimate the proportion of women who had resolution. A Kaplan\u2010Meier survival curve was generated to estimate the median time to resolution. The distance of the placental edge from the internal cervical os was used to categorize the placenta as previa or low\u2010lying (0.1\u201310 or\u2009\u2265\u200910\u201320\u2009mm). A time\u2010to\u2010event analysis was used to estimate predictive factors and the time to resolution by distance from the os.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 1663 (8.7%) women had a diagnosis of a low\u2010lying placenta or placenta previa. The cumulative resolution for women who completed 1 or more additional US examinations was 91.9% (95% confidence interval, 90.2%\u201093.3%). The median time to resolution was 10 (interquartile range [IQR], 7\u201313) weeks. The distance from the internal cervical os was known for 658 (51.0%) women. The probability of resolution was inversely proportional to the distance from the internal os: 99.5% (\u226510\u201320\u2009mm), 95.4% (0.1\u201310\u2009mm), and 72.3% (placenta previa; <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001). The median times to resolution were 9 (IQR, 7\u201312) weeks for 10 to 20\u2009mm, 10 (IQR, 7\u201313) weeks for 0.1 to 10\u2009mm, and 12 (IQR, 9\u201315) weeks for placenta previa (<jats:italic>P<\/jats:italic>\u2009=\u2009.0003, log rank test).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>A low\u2010lying placenta or placenta previa diagnosed at the midtrimester anatomy survey resolves in most patients. Resolution is near universal in patients with an initial distance from the internal os of 10\u2009mm or greater.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jum.14554","type":"journal-article","created":{"date-parts":[[2018,2,5]],"date-time":"2018-02-05T09:18:56Z","timestamp":1517822336000},"page":"2011-2019","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Resolution of a Low\u2010Lying Placenta and Placenta Previa Diagnosed at the Midtrimester Anatomy Scan"],"prefix":"10.1002","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7864-8497","authenticated-orcid":false,"given":"Jennifer K.","family":"Durst","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology Washington University St Louis Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Methodius G.","family":"Tuuli","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Washington University St Louis Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lorene A.","family":"Temming","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Washington University St Louis Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Owen","family":"Hamilton","sequence":"additional","affiliation":[{"name":"Washington University School of Medicine St Louis Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey M.","family":"Dicke","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Washington University St Louis Missouri 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