| lymphoid leukaemia | <haematology, oncology> An acute form of childhood leukaemia characterised by the development of abnormal cellsdevelop in the bone marrow and lymphoblasts are found in blood-formingtissues. A type of chronic leukaemia found most often in the elderly, it is characterised by the presence of mature lymphocytes in the blood. Origin: Gr. Haima = blood (13 Nov 1997) |
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| lymphoid polyp | Benign polyp consisting of aggregates of lymphocytes in the rectum. (05 Mar 2000) |
| lymphoid ring | The broken ring of lymphoid tissue, formed of the lingual, faucial, and pharyngeal tonsils. Synonym: Bickel's ring, tonsillar ring, Waldeyer's throat ring. (05 Mar 2000) |
| lymphoid series | The cells at various states in the development in lymphoid tissue of the mature lymphocytes, e.g., lymphoblasts, young lymphocytes, mature lymphocytes. (05 Mar 2000) |
| lymphoid tissue | <anatomy> Tissue that is particularly rich in lymphocytes (and accessory cells such as macrophages and reticular cells), particularly the lymph nodes, spleen, thymus, Peyer's patches, pharyngeal tonsils, adenoids and (in birds) the Bursa of Fabricius. Central lymphoid tissue: A term occasionally used as synonym for primary lymphoid tissue but should be avoided to prevent confusion between anatomical location, which is irrelevant and centrality in the system. Peripheral lymphoid tissue: Secondary lymphoid tissue, not necessarily located peripherally. Primary lymphoid tissue: Lymphoid tissues in which immune cells develop as opposed to the secondary or peripheral lymphoid tissues in which antigen independent or antigen dependent stages of maturation take place and in which responsive lymphocytes are found. Primary lymphoid tissues are foetal liver, adult bone marrow and thymus (and Bursa of Fabricius in birds). Secondary tissues are lymph nodes, spleen, tonsils and mucosa associated lymphoid tissue. (20 Mar 1998) |
| lymphoma, mucosa-associated lymphoid tissue | Extranodal lymphoma of lymphoid tissue associated with mucosa that is in contact with exogenous antigens. Many of the sites of these lymphomas, such as the stomach, salivary gland, and thyroid, are normally devoid of lymphoid tissue. They acquire malt tissue as a result of an immunologically mediated disorder. (12 Dec 1998) |
| Albini's nodules | Minute fibrous nodule's on the margins of the mitral and tricuspid valves of the heart, sometimes present in the neonate and representing foetal tissue rests; described previously by Cruveilhier. Compare: nodule of semilunar valve. (05 Mar 2000) |
| apple jelly nodules | Descriptive term for the papular lesions of lupus vulgaris, as they appear on diascopy. (05 Mar 2000) |
| Aschoff nodules | <pathology> Small granulomas composed of macrophages, lymphocytes and multinucleate cells grouped around eosinophilic hyaline material derived from collagen. Characteristic of the myocarditis of rheumatic fever. (18 Nov 1997) |
| Bohn's nodules | Tiny multiple cysts in newborns. They are found at the junction of the hard and soft palates and along buccal and lingual parts of the dental ridges and are derived from epithelial remnants of mucous gland tissue. (05 Mar 2000) |
| Caplan's nodules | <syndrome> Pneumoconiosis associated with rheumatoid arthritis. (12 Dec 1998) |
| Gamna-Gandy nodules | Small firm spheroidal or irregular foci that are yellow-brown, brown, or rustlike in colour, occurring chiefly in the spleen in such conditions as congestive splenomegaly and sickle cell disease, and consisting of relatively dense fibrous tissue or collagenous fibres impregnated with iron pigment and calcium salts; probably result from organization and scarring of sites where small perivascular haemorrhages occurred. Synonym: Gamna-Gandy nodules, Gandy-Gamna bodies, siderotic nodules. (05 Mar 2000) |
| malpighian nodules | Small nodular masses of lymphoid tissue attached to the sides of the smaller arterial branches. Synonym: folliculi lymphatici lienales, malpighian bodies, malpighian corpuscles, malpighian glands, malpighian nodules, splenic corpuscles, splenic lymph nodules. (05 Mar 2000) |
| cavitary lung nodules | <radiology> TB, fungal infection (including Coccidioides), septic pulmonary emboli, metastases, necrobiotic rheumatoid nodules, Wegener's granulomatosis (12 Dec 1998) |
| vocal cord nodules | Small, circumscribed, bilateral, beadlike enlargements on the vocal cords caused by overuse or abuse of the voice; often reversible by voice therapy. Synonym: singer's nodes, singer's nodules, teachers' nodes. (05 Mar 2000) |