| 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) |
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| ivory | 1. The hard, white, opaque, fine-grained substance constituting the tusks of the elephant. It is a variety of dentine, characterised by the minuteness and close arrangement of the tubes, as also by their double flexure. It is used in manufacturing articles of ornament or utility. Ivory is the name commercially given not only to the substance constituting the tusks of the elephant, but also to that of the tusks of the hippopotamus and walrus, the hornlike tusk of the narwhal, etc. 2. The tusks themselves of the elephant, etc. <zoology> Ivory gull, a white Arctic gull (Larus eburneus). <botany> Ivory nut, any species of Eburna, a genus of marine gastropod shells, having a smooth surface, usually white with red or brown spots. Vegetable ivory, the meat of the ivory nut. Origin: OE. Ivori, F. Ivoire, fr. L. Eboreus made of ivory, fr. Ebur, eboris, ivory, cf. Skr. Ibha elephant. Cf. Eburnean. Source: Websters Dictionary (01 Mar 1998) |
| ivory-bill | <zoology> A large, handsome, North American woodpecker (Campephilus principalis), having a large, sharp, ivory-coloured beak. Its general colour is glossy black, with white secondaries, and a white dorsal stripe. The male has a large, scarlet crest. It is now rare, and found only in the Gulf States. Source: Websters Dictionary (01 Mar 1998) |
| ivory exostosis | A small, rounded, eburnated tumour arising from a bone, usually one of the cranial bones. (05 Mar 2000) |
| ivory membrane | The lining membrane of the pulp cavity of a tooth, consisting of the odontoblastic layer. Synonym: ivory membrane. (05 Mar 2000) |
| ivory vertebra | A radiographically dense vertebra, usually from metastatic disease, especially lymphoma when solitary. (05 Mar 2000) |
| ivory vertebral body | <radiology> Single or multiple very dense vertebra: collapse, metastases, sclerotic metastasis or treated lytic metastasis, preservation of disc space and vertebral body size, Paget's disease, usually single vertebral body, expanded body with thickened cortex and coarsened trabeculation, disc space preserved, lymphoma, preservation of disc space and vertebral body size, infection (low grade), end plate destruction, disc space narrowing, paraspinal soft tissue mass (12 Dec 1998) |
| 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 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) |
| 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) |
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