Question 2162
{"accessible":true,"alternatives":[{"id":10732,"text":"calvarium, muscles of the scalp and the dura are not formed"},{"id":10733,"text":"frog face sign can be seen in the second trimester"},{"id":10734,"text":"it has an incidence of ~1:1000 pregnancies"},{"id":10735,"text":"maternal serum alpha-fetoprotein (MSAFP) levels are highly elevated"},{"id":10736,"text":"the abnormality occurs at the beginning of the 11th week of gestation when the anterior neuropore closes."}],"archived":false,"correctAlternativeId":10736,"explanation":"\u003cp\u003eThis is a case of an acrania exencephaly sequence in which the\u0026nbsp;abnormality occurs at the beginning of the fourth week of gestation when the anterior neuropore closes.\u003c/p\u003e","id":2162,"imageUrl":"https://prod-images-static.radiopaedia.org/images/4840088/0c124e4cbd2a85d00331cf900aa5343266d6f614ce12508fc22e3952ec4eae77_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":25171},"imageAttributionCaseInfo":{"title":"Acrania exencephaly sequence","contributor_name":"Kapil Sakinala","contributor_param":"kapil sakinala","case_rid":25171,"case_param":"acrania-exencephaly-sequence-2"},"firstQuestionPath":"/questions/2162","nextQuestionPath":null,"relatedArticles":[{"id":7362,"title":"Anencephaly","link":"/articles/anencephaly?lang=us"},{"id":12140,"title":"Acrania","link":"/articles/acrania?lang=us"},{"id":13935,"title":"Exencephaly","link":"/articles/exencephaly?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eA 20-year-old female\u0026nbsp;presented for routine antenatal scan. A single transverse ultrasound image is provided. All of the following are correct regarding the condition shown in the image \u003cstrong\u003eEXCEPT...\u003c/strong\u003e\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/2162"}],"attemptsPercentages":[{"alternativeId":"10734","percentage":16},{"alternativeId":"10736","percentage":51},{"alternativeId":"10735","percentage":11},{"alternativeId":"10733","percentage":10},{"alternativeId":"10732","percentage":12}],"promptToLogin":false,"questionManager":false,"articleId":"acrania-anencephaly-sequence"}