| organoid tumour | A tumour of complex structure, glandular in origin, containing epithelium, connective tissue, etc. (05 Mar 2000) |
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| organoid | 1. Resembling in superficial appearance or in structure any of the organs or glands of the body. 2. Composed of glandular or organic elements, and not of a single tissue; pertaining to certain neoplasms (e.g., an adenoma) that contain cytologic and histologic elements arranged in a pattern that closely resembles or is virtually identical to a normal organ. See: histoid. Synonym: organelle. Origin: organo-+ G. Eidos, resemblance (05 Mar 2000) |
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| organoid nevus | Congenital papillary acanthosis of the epidermis, with hyperplasia of sebaceous glands developing at puberty and presence of apocrine glands in non-apocrine areas of the skin (commonly the scalp). A variety of epithelial tumours may arise from a nevus sebaceus in adult life, most commonly basal cell carcinoma. Synonym: Jadassohn's nevus, organoid nevus. (05 Mar 2000) |
| acinar cell tumour | A solid and cystic tumour of the pancreas, occurring in young women; tumour cells contain zymogen granules. (05 Mar 2000) |
| acute splenic tumour | Acute splenitis, enlargement, and softening of the spleen, usually due to bacteraemia or severe bacterial toxaemia. (05 Mar 2000) |
| adenoid tumour | Adenoma, or neoplasm with glandlike spaces. (05 Mar 2000) |
| adenomatoid odontogenic tumour | A benign epithelial odontogenic tumour appearing radiographically as a well-circumscribed radiolucent-radiopaque lesion usually surrounding the crown of an impacted tooth in an adolescent or young adult; characterised histologically by columnar cells organised in a duct-like configuration interspersed with spindle-shaped cells and amyloid-like deposition that gradually undergoes dystrophic calcification. Synonym: adenoameloblastoma, ameloblastic adenomatoid tumour. (05 Mar 2000) |
| adenomatoid tumour | A small, circumscribed, benign tumour of the genital tract, composed of small glandlike spaces lined by flattened or cuboidal mesothelium-like cells. (12 Dec 1998) |
| adipose tumour | <oncology, tumour> Clumps of fat cells. Literally, fat cancer. These are benign tumours that can form in the breast. (16 Dec 1997) |
| adrenal gland tumour | <oncology> A benign tumour or adenoma, that usually results in the excess production of adrenal gland hormones. (27 Sep 1997) |
| adrenal rest tumour | A rare, usually benign, ovarian tumour thought to be derived from embryonic rest cells of the adrenals. This tumour causes various degrees of masculinization. (12 Dec 1998) |
| ameloblastic adenomatoid tumour | A benign epithelial odontogenic tumour appearing radiographically as a well-circumscribed radiolucent-radiopaque lesion usually surrounding the crown of an impacted tooth in an adolescent or young adult; characterised histologically by columnar cells organised in a duct-like configuration interspersed with spindle-shaped cells and amyloid-like deposition that gradually undergoes dystrophic calcification. Synonym: adenoameloblastoma, ameloblastic adenomatoid tumour. (05 Mar 2000) |
| amyloid tumour | A localised form of amyloidosis in which amyloid occurs as masses or nodules beneath the skin or mucous membranes, e.g., in the larynx. Synonym: amyloid tumour, focal amyloidosis. (05 Mar 2000) |
| angiomatoid tumour | A small, circumscribed, benign tumour of the genital tract, composed of small glandlike spaces lined by flattened or cuboidal mesothelium-like cells. (12 Dec 1998) |
| antigens, tumour-associated, carbohydrate | Carbohydrate antigens expressed by malignant tissue. They are useful as tumour markers and are measured in the serum by means of a radioimmunoassay employing monoclonal antibodies. (12 Dec 1998) |
| antigens, viral, tumour | Those proteins recognised by antibodies from serum of animals bearing tumours induced by viruses; these proteins are presumably coded for by the nucleic acids of the same viruses that caused the neoplastic transformation. (12 Dec 1998) |