Question 1872
{"accessible":false,"alternatives":[{"id":9297,"text":"hemangiopericytoma/malignant peripheral nerve sheath tumor"},{"id":9298,"text":"meningioma/metastases"},{"id":9299,"text":"meningioma/schwannoma"},{"id":9300,"text":"schwannoma/metastases"},{"id":9301,"text":"schwannoma/neurofibroma"}],"archived":false,"correctAlternativeId":9299,"explanation":"\u003cp\u003e\u003ca href=\"/articles/intradural-extramedullary-spinal-tumours-1\" title=\"Intradural extramedullary spinal tumours\"\u003eIntradural extramedullary tumors\u003c/a\u003e\u0026nbsp;are located outside the\u0026nbsp;spinal cord\u0026nbsp;but within the dural sheath.\u0026nbsp;70-80% of\u0026nbsp;spinal canal tumors\u0026nbsp;are of intradural extramedullary location.\u003c/p\u003e\u003cp\u003e\u0026nbsp;The most common primary intradural extramedullary tumors are\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/spinal-meningioma?lang=gb\"\u003emeningioma\u003c/a\u003e\u0026nbsp;(20-30%) and\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/spinal-schwannoma?lang=gb\"\u003eschwannoma\u003c/a\u003e\u0026nbsp;(15-50%), followed by:\u003c/p\u003e\u003cul\u003e\u003cli\u003e\u003cp\u003e\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/spinal-neurofibroma?lang=gb\"\u003eneurofibroma\u003c/a\u003e\u003c/p\u003e\u003c/li\u003e\u003cli\u003e\u003cp\u003eless common:\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/solitary-fibrous-tumour?lang=gb\"\u003esolitary fibrous tumor\u003c/a\u003e/\u003ca href=\"https://radiopaedia.org/articles/haemangiopericytoma-1?lang=gb\"\u003ehemangiopericytoma\u003c/a\u003e\u0026nbsp;and\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/malignant-peripheral-nerve-sheath-tumour?lang=gb\"\u003emalignant peripheral nerve sheath tumor\u003c/a\u003e\u003c/p\u003e\u003c/li\u003e\u003cli\u003e\u003cp\u003e\u003ca href=\"https://radiopaedia.org/articles/intradural-extramedullary-metastases?lang=gb\"\u003eleptomeningeal metastases\u003c/a\u003e\u0026nbsp;are frequently seen (5-15%) in the setting of solid tumors (most commonly\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/metastatic-melanoma?lang=gb\"\u003emelanoma\u003c/a\u003e,\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/small-cell-lung-cancer-4?lang=gb\"\u003esmall cell lung cancer\u003c/a\u003e, and\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/breast-neoplasms?lang=gb\"\u003ebreast cancer\u003c/a\u003e) and\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/who-classification-of-tumours-of-haematopoietic-and-lymphoid-tissues-1?lang=gb\"\u003ehematologic malignancie\u003c/a\u003e\u003c/p\u003e\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eIn children, the most common intradural extramedullary neoplasms are\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/leptomeningeal-drop-metastases?lang=gb\"\u003edrop metastases\u003c/a\u003e\u0026nbsp;from primary brain tumors (most commonly\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/medulloblastoma?lang=gb\"\u003emedulloblastoma\u003c/a\u003e). In adults, the most common drop metastases are from\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/glioblastoma?lang=gb\"\u003eglioblastoma\u003c/a\u003e.\u003c/p\u003e\u003cp\u003e\u0026nbsp;\u003c/p\u003e","id":1872,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1889","nextQuestionPath":"/articles/spinal-schwannoma/questions/1714","relatedArticles":[{"id":1436,"title":"Hemangiopericytoma (historical)","link":"/articles/haemangiopericytoma-historical?lang=us"},{"id":11066,"title":"Malignant peripheral nerve sheath tumor","link":"/articles/malignant-peripheral-nerve-sheath-tumour?lang=us"},{"id":19063,"title":"Spinal meningioma","link":"/articles/spinal-meningioma?lang=us"},{"id":19239,"title":"Intradural extramedullary spinal tumors","link":"/articles/intradural-extramedullary-spinal-tumours-1?lang=us"},{"id":19242,"title":"Intradural extramedullary metastases","link":"/articles/intradural-extramedullary-metastases?lang=us"},{"id":19576,"title":"Spinal neurofibroma","link":"/articles/spinal-neurofibroma?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhat are the two most common intradural extramedullary tumors in adults?\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/1872"}],"attemptsPercentages":[{"alternativeId":"9297","percentage":1},{"alternativeId":"9298","percentage":22},{"alternativeId":"9299","percentage":59},{"alternativeId":"9301","percentage":14},{"alternativeId":"9300","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"spinal-schwannoma"}