{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T10:29:41Z","timestamp":1783679381755,"version":"3.55.0"},"reference-count":15,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2022,11,29]],"date-time":"2022-11-29T00:00:00Z","timestamp":1669680000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Prenatal Diagnosis"],"published-print":{"date-parts":[[2023,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Non\u2010Invasive Prenatal Screening (NIPS) is a useful screening method for common aneuploidies that can occur in pregnancies. It yields high sensitivities and specificities for the targeted conditions it tests for. Most commonly, these include Trisomies in chromosomes 21, 18, and 13, as well as aneuploidies in chromosomes X and Y. It does not, however, replace diagnostic testing. We review four cases seen by our institutions of patients who had NIPS performed with low\u2010risk results and subsequently had fetuses affected with trisomy 18.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>All fetal samples were evaluated by level II anatomic ultrasound and tested on amniocytes or products of conception through karyotype or chromosomal microarray following low\u2010risk NIPS.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>None of the fetuses showed evidence of mosaicism and had features (both on ultrasound and postnatally) consistent with Trisomy 18. Postnatal fluorescence <jats:italic>in situ<\/jats:italic> hybridization performed on Formalin\u2010Fixed Paraffin\u2010Embedded tissue from 3 of the affected pregnancies' placentas identified mosaicism of trisomy 18.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>We discuss the possible explanations for the discrepancy between NIPS results and fetal karyotype, including, but not limited to placental mosaicism, placental size, and limitations of NIPS as a screening test.<\/jats:p><\/jats:sec>","DOI":"10.1002\/pd.6273","type":"journal-article","created":{"date-parts":[[2022,11,25]],"date-time":"2022-11-25T09:59:44Z","timestamp":1669370384000},"page":"36-41","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Prenatal and fetal diagnosis of trisomy 18 after low\u2010risk cell\u2010free fetal DNA screening: A report of four cases"],"prefix":"10.1002","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9656-4334","authenticated-orcid":false,"given":"Elizabeth","family":"Sheehan","sequence":"first","affiliation":[{"name":"Center for Medical Genetics UPMC Magee\u2010Womens Hospital  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victoria","family":"Bacon","sequence":"additional","affiliation":[{"name":"Center for Medical Genetics UPMC Magee\u2010Womens Hospital  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seth","family":"Lascurain","sequence":"additional","affiliation":[{"name":"Maternal Fetal Medicine Department UPMC Harrisburg  Harrisburg Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"Stone","sequence":"additional","affiliation":[{"name":"Center for Medical Genetics UPMC Magee\u2010Womens Hospital  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Svetlana","family":"Yatsenko","sequence":"additional","affiliation":[{"name":"Department of Medical Genetics and Genomics Laboratories UPMC  Pittsburgh Pennsylvania USA"},{"name":"Departments of Pathology and Obstetrics, Gynecology, and Reproductive Sciences UPMC  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mahmoud","family":"Aarabi","sequence":"additional","affiliation":[{"name":"Department of Medical Genetics and Genomics Laboratories UPMC  Pittsburgh Pennsylvania USA"},{"name":"Departments of Pathology and Obstetrics, Gynecology, and Reproductive Sciences UPMC  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren B.","family":"Skvarca","sequence":"additional","affiliation":[{"name":"Departments of Pathology and Obstetrics, Gynecology, and Reproductive Sciences UPMC  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michele","family":"Clemens","sequence":"additional","affiliation":[{"name":"Center for Medical Genetics UPMC Magee\u2010Womens Hospital  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Devereux","family":"Saller","sequence":"additional","affiliation":[{"name":"Departments of Pathology and Obstetrics, Gynecology, and Reproductive Sciences UPMC  Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,11,29]]},"reference":[{"key":"e_1_2_9_2_1","first-page":"1","article-title":"Screening for fetal chromosomal abnormalities. 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