Question 525
{"accessible":true,"alternatives":[{"id":2633,"text":"choroid plexus papilloma"},{"id":2634,"text":"ependymoma"},{"id":2635,"text":"hemangioblastoma"},{"id":2636,"text":"medulloblastoma"},{"id":2637,"text":"pilocytic astroctyoma"}],"archived":false,"correctAlternativeId":2634,"explanation":"\u003cp\u003eThe majority of intracranial ependymomas (60%) are located in the posterior fossa, usually arising from the floor of the fourth ventricle – This is especially true in children. They\u0026nbsp;are apt to extend through the foramina of Luschka and Magendie, hence the term plastic ependymoma. This is a characteristic feature and can be seen on both CT and MRI and seen in this case.\u0026nbsp;\u003c/p\u003e\u003cp\u003eEpendymomas are typically heterogeneous masses with areas of necrosis, calcification, cystic change and hemorrhage frequently seen. This results in a heterogeneous appearance on all modalities.\u0026nbsp;\u003c/p\u003e\u003cp\u003eMedulloblastomas are usually somewhat more circumscribed and in this age group usually vermian. Hemangioblastomas are seen in young adults\u0026nbsp;and are most frequently a vividly enhancing nodule, often with a cyst and prominent flow voids. Similarly, pilocytic astrocytomas tend to be a cyst with a mural nodule.\u0026nbsp;\u003c/p\u003e","id":525,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/733/image0006_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":21746},"imageAttributionCaseInfo":{"title":"Ependymoma","contributor_name":"Jeremy Jones","contributor_param":"drjermy","case_rid":21746,"case_param":"ependymoma-6"},"firstQuestionPath":"/questions/2249","nextQuestionPath":"/articles/pilocytic-astrocytoma/questions/462","relatedArticles":[{"id":1290,"title":"Ependymoma","link":"/articles/ependymoma?lang=us"},{"id":5335,"title":"Medulloblastoma","link":"/articles/medulloblastoma?lang=us"},{"id":4145,"title":"Intraventricular neoplasms and lesions","link":"/articles/intraventricular-neoplasms-and-lesions?lang=us"},{"id":8627,"title":"Choroid plexus papilloma","link":"/articles/choroid-plexus-papilloma-1?lang=us"},{"id":21040,"title":"Intraventricular masses (an approach)","link":"/articles/intraventricular-masses-an-approach-1?lang=us"},{"id":1412,"title":"Hemangioblastoma (central nervous system)","link":"/articles/haemangioblastoma-central-nervous-system-2?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eA 3-year-old girl presents with a\u0026nbsp;headache. She undergoes a contrast enhanced MRI. What is the most likely diagnosis?\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/525"}],"attemptsPercentages":[{"alternativeId":"2633","percentage":2},{"alternativeId":"2636","percentage":25},{"alternativeId":"2635","percentage":3},{"alternativeId":"2634","percentage":60},{"alternativeId":"2637","percentage":9}],"promptToLogin":false,"questionManager":false,"articleId":"pilocytic-astrocytoma"}