Question 1788
{"accessible":true,"alternatives":[{"id":8881,"text":"azygous anterior cerebral artery"},{"id":8882,"text":"fetal posterior communicating artery"},{"id":8883,"text":"persistent hypoglossal artery"},{"id":8884,"text":"persistent proatlantal artery"},{"id":8885,"text":"persistent trigeminal artery"}],"archived":false,"correctAlternativeId":8885,"explanation":"\u003cp\u003eA persistent primitive trigeminal artery\u0026nbsp;is one of the \u003ca href=\"/articles/persistent-carotid-vertebrobasilar-anastomoses-2\" title=\"Persistent carotid-vertebrobasilar anastomoses\"\u003epersistent carotid-vertebrobasilar anastomoses\u003c/a\u003e.\u0026nbsp;In utero, the trigeminal artery supplies the basilar artery before the development of the posterior communicating and vertebral arteries. The persistent primitive trigeminal artery arises from the junction between petrous and cavernous ICA, and runs posterolaterally along the trigeminal nerve (41%), or crosses over or through the dorsum sellae (59%). Vertebral, posterior communicating and caudal basilar arteries are often hypoplastic.\u0026nbsp;\u003c/p\u003e\u003cp\u003eThe \u003ca href=\"/articles/trident-sign-persistent-primitive-trigeminal-artery\" title=\"Trident sign (persistent primitive trigeminal artery)\"\u003etrident sign\u003c/a\u003e of a persistent primitive trigeminal artery refers to the appearance of the intracranial circulation on lateral projection. The internal carotid artery, the abnormal vessel and superior portion of the basilar artery resemble the Greek letter tau (thus it's alternative name of tau sign).\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003c/p\u003e","id":1788,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/280/FG_MCQ_my_copy__SQUARE_.key_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":34972},"imageAttributionCaseInfo":{"title":"Trigeminal artery and basilar ectasia","contributor_name":"Craig Hacking","contributor_param":"hackingc","case_rid":34972,"case_param":"trigeminal-artery-and-basilar-ectasia"},"firstQuestionPath":"/questions/1788","nextQuestionPath":null,"relatedArticles":[],"alsoUsedIn":[{"id":771,"kind":"Course","title":"Stroke Learning Pathway - page 771","link":"https://radiopaedia.org/courses/stroke-learning-pathway/pages/771"},{"id":2108,"kind":"Course","title":"Stroke Learning Pathway - peer review - page 2108","link":"https://radiopaedia.org/courses/stroke-learning-pathway-peer-review/pages/2108"}],"stem":"\u003cp\u003eWhat vascular abnormality is demonstrated in the accompanying image (axial MRA, lateral DSA)?\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/1788"}],"attemptsPercentages":[{"alternativeId":"8884","percentage":2},{"alternativeId":"8883","percentage":5},{"alternativeId":"8885","percentage":56},{"alternativeId":"8882","percentage":33},{"alternativeId":"8881","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"persistent-carotid-vertebrobasilar-anastomoses"}