| hematoma | <haematology, pathology> A localised collection of blood, usually clotted, in an organ, space or tissue, due to a break in the wall of a blood vessel. (18 Nov 1997) |
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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) |
| intradural-extramedullary mass | <radiology> Meniscus sign, neurofibroma / schwannoma, meningioma, drop metastasis, lipoma, dermoid, angioma, ependymoma of filum terminale (really intramedullary) (12 Dec 1998) |
| extramedullary | Outside of, or unrelated to, any medulla, especially the medulla oblongata. (05 Mar 2000) |