Question 90
{"accessible":false,"alternatives":[{"id":459,"text":"minimally enhancing diffuse infiltrating mass with calcification"},{"id":460,"text":"mixed solid/cystic mass with prominent flow voids"},{"id":461,"text":"non-enhancing cortical lesion with areas of FLAIR attenuation"},{"id":462,"text":"peripherally enhancing mass with central restricted diffusion"},{"id":463,"text":"predominantly solid mass with central intrinsic high T1 signal"},{"id":464,"text":"primarily cystic mass with a brightly enhancing mural nodule"}],"archived":false,"correctAlternativeId":464,"explanation":"\u003cp\u003ePilocytic astrocytomas range in appearance:\u003c/p\u003e\u003cul\u003e\n\u003cli\u003elarge cystic component with a brightly enhancing mural nodule:\u0026nbsp;67%\u003cul\u003e\n\u003cli\u003enon-enhancing cyst wall:\u0026nbsp;21%\u003c/li\u003e\n\u003cli\u003eenhancing cyst wall:\u0026nbsp;46%\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eheterogeneous, mixed solid and multiple cysts and central necrosis:\u0026nbsp;16%\u003c/li\u003e\n\u003cli\u003ecompletely solid:\u0026nbsp;17%\u003c/li\u003e\n\u003c/ul\u003e\u003cp\u003eEnhancement is almost invariably present (~95%). Up to 20% may demonstrate some calcification.\u0026nbsp;\u003c/p\u003e","id":90,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2249","nextQuestionPath":"/articles/pilocytic-astrocytoma/questions/89","relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eWhat is the typical MRI\u0026nbsp;appearance of pilocytic astrocytomas?\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/90"}],"attemptsPercentages":[{"alternativeId":"464","percentage":81},{"alternativeId":"463","percentage":4},{"alternativeId":"462","percentage":2},{"alternativeId":"461","percentage":5},{"alternativeId":"460","percentage":5},{"alternativeId":"459","percentage":5}],"promptToLogin":false,"questionManager":false,"articleId":"pilocytic-astrocytoma"}