{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T01:37:34Z","timestamp":1792978654280,"version":"4.5.0"},"reference-count":57,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2021,12,1]],"date-time":"2021-12-01T00:00:00Z","timestamp":1638316800000},"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":["Ultrasound in Obstet &amp;amp; Gyne"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To describe the prenatal neuroimaging spectrum of rhombencephalosynapsis (RES) and criteria for its classification according to the severity of vermian anomaly.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In this multicenter retrospective study of fetuses with RES between 2002 and 2020, the medical records and brain ultrasound and magnetic resonance images were evaluated comprehensively to determine the severity of the vermian anomaly and the presence of associated brain findings. RES was classified, according to the pattern of vermian agenesis and the extent of the fusion of the hemispheres, as complete RES (complete absence of the vermis) or partial RES (further classified according to the part of the vermis that was missing and, consequently, the region of hemispheric fusion, as anterior, posterior, severe  or  mixed RES). Findings were compared between cases with complete and those with partial RES.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Included in the study were 62 fetuses with a gestational age ranging between 12 and 37\u2009weeks. Most had complete absence of the vermis (complete RES, 77.4% of cases), a \u2018round\u2010shaped\u2019 cerebellum on axial views (72.6%) and a transverse cerebellar diameter (TCD) &lt;\u20093<jats:sup>rd<\/jats:sup> centile (87.1%). Among the 22.6% of cases with partial RES, 6.5% were classified as severe partial, 6.5% as partial anterior, 8.1% as partial mixed and 1.6% as partial posterior. Half of these cases presented with normal or nearly normal cerebellar morphology and 28.5% had a TCD within the normal limits. Infratentorially, the fourth ventricle was abnormal in 88.7% of cases overall, and anomalies of the midbrain and pons were frequent (93.5% and 77.4%, respectively). Ventriculomegaly was observed in 80.6% of all cases, being more severe in cases with complete RES than in those with partial RES, with high rates of parenchymal and septal disruption.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study provides prenatal neuroimaging criteria for the diagnosis and classification of RES, and identification of related features, using ultrasound and magnetic resonance imaging. According to our findings, a diagnosis of RES should be considered in fetuses with a small TCD (severe cerebellar hypoplasia) and\/or a round\u2010shaped cerebellum on axial views, during the second or third trimester, especially when associated with ventriculomegaly. Partial RES is more common than previously thought, but presents an extreme diagnostic challenge, especially in cases with normal or nearly\u2010normal cerebellar morphobiometric features. \u00a9 2021 International Society of Ultrasound in Obstetrics and Gynecology.<\/jats:p><\/jats:sec>","DOI":"10.1002\/uog.23660","type":"journal-article","created":{"date-parts":[[2021,5,4]],"date-time":"2021-05-04T10:47:00Z","timestamp":1620125220000},"page":"864-874","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Prenatal diagnosis of rhombencephalosynapsis: neuroimaging features and severity of vermian anomaly"],"prefix":"10.1002","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9868-3548","authenticated-orcid":false,"given":"K.","family":"Krajden Haratz","sequence":"first","affiliation":[{"name":"Fetal Neurology Multidisciplinary Group, Division of Ultrasound in Obstetrics and Gynecology Lis Maternity Hospital, Tel Aviv Sourasky Medical Center  Tel Aviv Israel"},{"name":"Sackler School of Medicine Tel Aviv University  Tel Aviv Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Oliveira Szejnfeld","sequence":"additional","affiliation":[{"name":"Instituto D'Or de Pesquisa e Ensino  Rio de Janeiro Brazil"},{"name":"DDI UNIFESP  S\u00e3o Paulo Brazil"},{"name":"Funda\u00e7\u00e3o Instituto de Pesquisa e Estudo de Diagnostico por Imagem  S\u00e3o Paulo Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Govindaswamy","sequence":"additional","affiliation":[{"name":"Sackler School of Medicine Tel Aviv University  Tel Aviv Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9661-2559","authenticated-orcid":false,"given":"Z.","family":"Leibovitz","sequence":"additional","affiliation":[{"name":"Ultrasound in Obstetrics and Gynecology Unit Bnai\u2010Zion Medical Center  Haifa Israel"},{"name":"Technion Faculty of Medicine  Haifa Israel"},{"name":"Fetal Neurology Clinic, Ultrasound in Obstetrics and Gynecology Unit, Department of Obstetrics and Gynecology Wolfson Medical Center  Holon Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7827-1922","authenticated-orcid":false,"given":"L.","family":"Gindes","sequence":"additional","affiliation":[{"name":"Sackler School of Medicine Tel Aviv University  Tel Aviv Israel"},{"name":"Fetal Neurology Clinic, Ultrasound in Obstetrics and Gynecology Unit, Department of Obstetrics and Gynecology Wolfson Medical Center  Holon Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Severino","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit IRCCS Istituto Giannini Gaslini  Genoa Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Rossi","sequence":"additional","affiliation":[{"name":"Neuroradiology Unit IRCCS Istituto Giannini Gaslini  Genoa Italy"},{"name":"Department of Health Sciences (DISSAL) University of Genoa  Genoa Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5102-6062","authenticated-orcid":false,"given":"D.","family":"Paladini","sequence":"additional","affiliation":[{"name":"Fetal Medicine Unit IRCCS Istituto G. 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