Question 559
{"accessible":false,"alternatives":[{"id":2801,"text":"perivascular pseudorosette"},{"id":2802,"text":"pseudopalisading necrosis"},{"id":2803,"text":"Rosenthal fibres"},{"id":2804,"text":"specific glioneuronal element"},{"id":2805,"text":"whorls and psammoma bodies"}],"archived":false,"correctAlternativeId":2804,"explanation":"\u003cp\u003eThe \"specific glioneuronal element (SGNE)\" is characteristic, and refers to columnar bundles of axons surrounded by oligodendrocyte-like cells which are orientated at right angles to the overlying cortical surface. Between these columns are \"floating neurones\" as well as stellate astrocytes.\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003ca title=\"Perivascular pseudorosettes (ependymoma)\" class=\"internal\" href=\"/articles/perivascular-pseudorosettes-ependymoma\"\u003ePerivascular pseudorosettes\u003c/a\u003e describe tumour cells arranged radially around a central vessel and are a common feature of \u003ca title=\"Ependymomas\" class=\"internal\" href=\"/articles/ependymoma\"\u003eependymomas\u003c/a\u003e.\u003c/p\u003e\u003cp\u003ePseudopalisading necrosis is a histological feature of necrosis found in \u003ca title=\"Glioblastoma, IDH-wildtype\" class=\"internal\" href=\"/articles/glioblastoma-idh-wildtype\"\u003eglioblastoma\u003c/a\u003e, often associated with poor prognosis.\u003c/p\u003e\u003cp\u003e\u003ca title=\"Rosenthal fibres\" class=\"internal\" href=\"/articles/rosenthal-fibres\"\u003eRosenthal fibres\u003c/a\u003e are astrocytic\u0026nbsp;cytoplasmic inclusions, typically found in areas of longstanding gliosis, classically described in \u003ca title=\"Pilocytic astrocytoma\" class=\"internal\" href=\"/articles/pilocytic-astrocytoma\"\u003epilocytic astrocytoma\u003c/a\u003e.\u003c/p\u003e\u003cp\u003e\u003ca title=\"Psammoma bodies\" class=\"internal\" href=\"/articles/psammoma-bodies\"\u003ePsammoma bodies\u003c/a\u003e are areas of dystrophic calcification seen in a number of tumours, but in a CNS context are typical of \u003ca title=\"Meningioma\" class=\"internal\" href=\"/articles/meningioma\"\u003emeningioma\u003c/a\u003e.\u003c/p\u003e\u003cp\u003e\u0026nbsp;\u003c/p\u003e","id":559,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/3033","nextQuestionPath":null,"relatedArticles":[{"id":9211,"title":"Rosenthal fibres","link":"/articles/rosenthal-fibres?lang=gb"},{"id":1928,"title":"Psammoma bodies","link":"/articles/psammoma-bodies?lang=gb"},{"id":51729,"title":"Perivascular pseudorosettes (ependymoma)","link":"/articles/perivascular-pseudorosettes-ependymoma?lang=gb"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhich of the following histological features is characteristic of\u0026nbsp;dysembryoplastic neuroepithelial tumour (DNET)?\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/559"}],"attemptsPercentages":[{"alternativeId":"2803","percentage":11},{"alternativeId":"2804","percentage":53},{"alternativeId":"2805","percentage":14},{"alternativeId":"2801","percentage":16},{"alternativeId":"2802","percentage":6}],"promptToLogin":false,"questionManager":false,"articleId":"dysembryoplastic-neuroepithelial-tumour"}