{"id":4107,"date":"2019-03-12t15:39:31","date_gmt":"2019-03-12t04:39:31","guid":{"rendered":"http:\/\/ultrasoundtraining.site\/?page_id=4107"},"modified":"2021-08-08t22:46:37","modified_gmt":"2021-08-08t12:46:37","slug":"umbilical-vein-varix","status":"publish","type":"x5_anomaly_database","link":"\/\/www.iolishoes.com\/anomaly-database\/umbilical-vein-varix\/","title":{"rendered":"umbilical vein varix"},"content":{"rendered":"\t\t
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<\/span>description<\/span><\/h2>

an umbilical vein varix is a focal dilatation of the umbilical vein that usually involves the intra-abdominal portion of the umbilical cord. however, an umbilical vein varix of the intra-amniotic portion of the umbilical vein may also occur. umbilical vein varices represent approximately 4% of umbilical vein malformations.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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<\/span>diagnosis<\/span><\/h2>

the internal diameter of the intra-abdominal umbilical vein increases linearly with gestational age. at 15, 30 and 40 weeks’ gestation, the intra-abdominal umbilical vein diameter is 2.5 mm, 5.5 mm, and 7.5 mm, respectively. while most umbilical vein varices are just over 2 sd above the mean umbilical vein diameter for the patient’s gestational age, occasionally they may be quite large. fuster and co-workers have reported a case of an umbilical vein varix with a mean diameter of 8.5 cm. an umbilical vein varix has not been associated with other congenital malformations. challis and co-workers reported that 2 of their 8 cases with an intra-abdominal varix were karyotypically abnormal – one fetus with trisomy 18 and one fetus with trisomy 21. they, therefore, suggested that the detection of an umbilical vein varix should prompt a careful fetal anatomic survey for other abnormalities. if additional anomalies are detected, karyotyping is indicated. however, karyotyping is not necessary with an isolated umbilical vein varix.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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<\/span>differential diagnosis<\/span><\/h2>

an umbilical vein varix is generally located just below the umbilicus. in this location it may be confused with a urachal cyst, an ovarian cyst, or a mesenteric cyst. only an umbilical vein varix will have vascular flow detected with color doppler.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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<\/span>sonographic features<\/span><\/h2>

color doppler will readily distinguish an umbilical vein varix from a urachal cyst that may be in the same region of the fetal abdomen.<\/p>

if the varix partially thromboses, a doppler signal may only be obtained from a portion of the varix.<\/p>

an umbilical varix is associated with an increased risk of adverse fetal outcome and fetal demise.<\/p>

the rate and extent of umbilical vein thrombosis determines whether growth restriction, hydrops, or fetal demise occurs.<\/p>

an umbilical vein varix appears to be a developmental rather than an embyologic abnormality.<\/p>

in several cases, fetuses with an umbilical vein varix at 22 to 32 weeks’ gestation had a normal ultrasound examination at 16 to 19 weeks’ gestation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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<\/span>associated syndromes<\/span><\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

an umbilical vein varix is a focal dilatation of the umbilical vein that usually involves the intra-abdominal portion of the umbilical cord. however, an umbilical vein varix of the intra-amniotic portion of the umbilical vein may also occur. umbilical vein varices represent approximately 4% of umbilical vein malformations.<\/p>\n","protected":false},"author":10,"featured_media":0,"menu_order":0,"template":"","tags":[23],"class_list":["post-4107","x5_anomaly_database","type-x5_anomaly_database","status-publish","hentry","tag-obstetric"],"_links":{"self":[{"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/x5_anomaly_database\/4107","targethints":{"allow":["get"]}}],"collection":[{"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/x5_anomaly_database"}],"about":[{"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/types\/x5_anomaly_database"}],"author":[{"embeddable":true,"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/users\/10"}],"version-history":[{"count":0,"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/x5_anomaly_database\/4107\/revisions"}],"wp:attachment":[{"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/media?parent=4107"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"\/\/www.iolishoes.com\/wp-json\/wp\/v2\/tags?post=4107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}