Question 1688
{"accessible":false,"alternatives":[{"id":8395,"text":"a Chiari 1 malformation with downward displacement also of the medulla. "},{"id":8396,"text":"a Chiari 1 malformation with prominent syrinx of the cervical cord."},{"id":8397,"text":"a Chiari 2 malformation with the conus located above the level of L3. "},{"id":8398,"text":"a Chiari 2 malformation without hydrocephalus or other intracranial complications. "}],"archived":false,"correctAlternativeId":8395,"explanation":"\u003cp\u003e\u003cstrong\u003eChiari 1.5 malformation\u003c/strong\u003e, or\u0026nbsp;\u003cstrong\u003ebulbar variant of Chiari I malformation\u003c/strong\u003e, is a term used in the literature to describe the combination of cerebellar tonsillar herniation (as seen in\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/chiari-i-malformation?lang=gb\"\u003eChiari I malformation\u003c/a\u003e) along with caudal herniation of some portion of the\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/brainstem?lang=gb\"\u003ebrainstem\u003c/a\u003e\u0026nbsp;(often obex of the\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/medulla-oblongata?lang=gb\"\u003emedulla oblongata\u003c/a\u003e) through the\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/foramen-magnum?lang=gb\"\u003eforamen magnum\u003c/a\u003e. It is considered a progression of\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/chiari-i-malformation?lang=gb\"\u003eChiari I malformation\u003c/a\u003e.\u003c/p\u003e","id":1688,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1688","nextQuestionPath":null,"relatedArticles":[{"id":5786,"title":"Chiari II malformation","link":"/articles/chiari-ii-malformation?lang=us"},{"id":30829,"title":"Chiari 1.5 malformation","link":"/articles/chiari-15-malformation?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eA Chiari 1.5 malformation is best described as...\u0026nbsp;\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/1688"}],"attemptsPercentages":[{"alternativeId":"8395","percentage":78},{"alternativeId":"8398","percentage":5},{"alternativeId":"8397","percentage":2},{"alternativeId":"8396","percentage":15}],"promptToLogin":false,"questionManager":false,"articleId":"chiari-i-malformation"}