| osteoma medullare | An osteoma containing spaces that are filled (or partly filled) with various elements of bone marrow. Osteoid osteoma, a painful benign neoplasm that usually originates in one of the bones of the lower extremities, especially the femur or tibia of adolescent and young adult persons; characterised by a nidus (usually no larger than 1 cm in diameter) that consists of osteoid material, vascularised osteogenic stroma, and poorly formed bone; around the nidus there is a relatively large zone of reactive thickening of the cortex. Osteoma spongiosum, an osteoma that consists chiefly of cancellous bone tissue. (05 Mar 2000) |
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| velum medullare inferius | A thin sheet of white matter, hidden by the cerebellar tonsil, attached along the peduncle of the flocculus and, at and near the midline, to the nodulus of the vermis; it is continuous caudally with the epithelial lamina and choroid plexus of the fourth ventricle. Synonym: velum medullare inferius, posterior medullary velum, Tarin's valve, valvula semilunaris tarini, velum semilunare, velum tarini. (05 Mar 2000) |
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| velum medullare superius | The thin layer of white matter stretching between the two superior cerebellar peduncles, forming the roof of the superior recess of the fourth ventricle. Synonym: velum medullare superius, anterior medullary velum, Vieussens' valve. (05 Mar 2000) |
| giant osteoid osteoma | A benign, painful, tumour of bone characterised by the formation of osteoid tissue, primitive bone and calcified tissue. It occurs frequently in the spine of young persons. (12 Dec 1998) |
| cavum medullare | The marrow cavity in the shaft of a long bone. Synonym: cavitas medullaris, cavum medullare. (05 Mar 2000) |
| centrum medullare | The great mass of white matter composing the interior of the cerebral hemisphere; the name refers to the general shape of this white core in horizontal sections of the hemisphere. Synonym: centrum medullare, centrum ovale, medullary centre, semioval centre, Vicq d'Azyr's centrum semiovale, Vieussens' centrum. (05 Mar 2000) |
| corpus medullare cerebelli | The interior white substance of the cerebellum. (05 Mar 2000) |
| osteoid osteoma | <radiology> M more than F, 15 - 30 years of age, lucent nidus with thickened cortex, metaphyseal, femur, talus, tibia, patella, rarely spine, never skull or clavicle, pain at night, relievey be inflammatory rather than neoplastic, treatment: leave it (disappears in 4-6 yrs), or remove nidus, Differential diagnosis: TB abscess, chronic osteo (Brodie abscess), sclerosing osteomyelitis of Garre (12 Dec 1998) |
| osteoma | <oncology, tumour> Benign tumour of bone. (18 Nov 1997) |
| osteoma, osteoid | Benign circumscribed tumour of spongy bone occurring especially in the bones of the extremities and vertebrae, most often in young persons. (12 Dec 1998) |
| fibro-osteoma | <tumour> An osteoma in which the neoplastic bone-forming cells are situated within a relatively abundant stroma of fibrous tissue. (05 Mar 2000) |