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The diagnosis of early ventriculomegaly was suspected subjectively by identification of increased cerebrospinal fluid within the lateral ventricles and confirmed by measuring choroid plexus\u2010to\u2010lateral ventricle length and area ratios. Subsequent scans revealed complete ACC in two cases and partial ACC in the other two. This report adds to the increasing evidence suggesting that first\u2010trimester ventriculomegaly is a strong sonographic marker of underlying brain anomalies, including less evident malformations such as ACC. Detailed second\u2010trimester fetal neurosonography in those women continuing their pregnancies should be performed.<\/jats:p>","DOI":"10.1002\/jcu.23475","type":"journal-article","created":{"date-parts":[[2023,5,2]],"date-time":"2023-05-02T06:39:15Z","timestamp":1683009555000},"page":"827-832","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["First\u2010trimester ventriculomegaly in fetuses with callosal agenesis: Cause or association?"],"prefix":"10.1002","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3856-574X","authenticated-orcid":false,"given":"Waldo","family":"Sepulveda","sequence":"first","affiliation":[{"name":"FETALMED\u2013Maternal\u2010Fetal Diagnostic Center, Fetal Imaging Unit  Santiago Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Diane","family":"Quach","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynaecology Monash University 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