| extramedullary | Outside of, or unrelated to, any medulla, especially the medulla oblongata. (05 Mar 2000) |
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| haematopoiesis, extramedullary | The formation and development of blood cells outside the bone marrow, as in the spleen, liver, or lymph nodes. (12 Dec 1998) |
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| intradural-extramedullary mass | <radiology> Meniscus sign, neurofibroma / schwannoma, meningioma, drop metastasis, lipoma, dermoid, angioma, ependymoma of filum terminale (really intramedullary) (12 Dec 1998) |