Question 2175
{"accessible":true,"alternatives":[{"id":10799,"text":"mono-chorionic mono-amniotic twin pregnancy is shown"},{"id":10800,"text":"thick inter-twin membrane is often taken as \u003e 2 cm"},{"id":10801,"text":"this type of twin pregnancy carries the worst prognosis among all twin pregnancies"},{"id":10802,"text":"T sign is shown which represents mono-chorionic di-amniotic twin pregnancy"},{"id":10803,"text":"twin peak sign is shown which represents di-chorionic di-amniotic twin pregnancy"}],"archived":false,"correctAlternativeId":10803,"explanation":"\u003cp\u003eThe\u0026nbsp;\u003cstrong\u003etwin peak sign\u003c/strong\u003e\u0026nbsp;(also known as the\u0026nbsp;\u003cstrong\u003elambda (λ)\u0026nbsp;sign\u003c/strong\u003e)\u0026nbsp;is a triangular appearance of the\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/chorion?lang=gb\"\u003echorion\u003c/a\u003e\u0026nbsp;insinuating between the layers of the\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/intertwin-membrane?lang=gb\"\u003eintertwin membrane\u003c/a\u003e\u0026nbsp;and strongly suggests a\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/missing?article%5Btitle%5D=dichorionic-twin-pregnancy\u0026amp;lang=gb\"\u003edichorionic twin pregnancy\u003c/a\u003e.\u0026nbsp;It is best seen in the first trimester (between 11-14 weeks). Di-chorionic di-amniotic twin pregnancy has the best prognosis among all twin pregnancies.\u0026nbsp;\u003c/p\u003e\u003cp\u003eA thick inter-twin membrane is often taken as \u0026gt; 2 mm.\u003c/p\u003e","id":2175,"imageUrl":"https://prod-images-static.radiopaedia.org/images/634479/3960812e3edbbb1cd05e43b36cbf7d_big_gallery.jpg","imageAttribution":{"kind":"case","rID":12931},"imageAttributionCaseInfo":{"title":"Twin-peak sign","contributor_name":"Bruno Di Muzio","contributor_param":"bmuzio","case_rid":12931,"case_param":"twin-peak-sign"},"firstQuestionPath":"/questions/2175","nextQuestionPath":"/articles/twin-peak-sign-2/questions/2174","relatedArticles":[{"id":13816,"title":"Monochorionic monoamniotic twin pregnancy","link":"/articles/monochorionic-monoamniotic-twin-pregnancy?lang=us"},{"id":14534,"title":"Dichorionic diamniotic twin pregnancy","link":"/articles/dichorionic-diamniotic-twin-pregnancy?lang=us"},{"id":13806,"title":"Monochorionic diamniotic twin pregnancy","link":"/articles/monochorionic-diamniotic-twin-pregnancy?lang=us"},{"id":2142,"title":"T sign (obstetrics)","link":"/articles/t-sign-obstetrics-1?lang=us"}],"alsoUsedIn":[{"id":894,"kind":"Course","title":"2021 Virtual Conference Private Use - page 894","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/894"},{"id":894,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 894","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/894"},{"id":894,"kind":"Course","title":"Obstetrics \u0026 Gynaecology Lectures - page 894","link":"https://radiopaedia.org/courses/obgyn-lectures/pages/894"}],"stem":"\u003cp\u003eA 25-year-old female presented for routine antenatal ultrasound. A single transverse ultrasound image is provided. Which of the following options regarding the provided image is correct?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2175"}],"attemptsPercentages":[{"alternativeId":"10799","percentage":6},{"alternativeId":"10800","percentage":9},{"alternativeId":"10801","percentage":4},{"alternativeId":"10802","percentage":17},{"alternativeId":"10803","percentage":65}],"promptToLogin":false,"questionManager":false,"articleId":"twin-peak-sign"}