| mouse mammary tumour virus | Member of the retrovirus subfamily Oncornavirinae, antigenically distinct from the murine leukaemia-sarcoma complex, that is associated with adenocarcinomatous tumours of the mammary gland, commonly latent in wild and laboratory mice and causing cancer only in genetically susceptible strains under certain hormonal influences. Synonym: Bittner agent, Bittner virus, Bittner's milk factor, mammary cancer virus of mice, milk factor, mouse mammary tumour virus. (05 Mar 2000) |
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| mouse parotid tumour virus | <virology> A papovavirus (genus Polyomavirus, family Papovaviridae) which is a DNA tumour virus with very small genome. Polyoma was isolated from mice, in which it causes no obvious disease, but when injected at high titre into baby rodents, including mice, it causes tumours of a wide variety of histological types (hence polyoma). In vitro, infected mouse cells are permissive for virus replication and thus are killed, whilst hamster cells undergo abortive infection and at a low frequency become transformed. It is capable of producing parotid tumours in mice and sarcomas in hamsters as well as tumours in other laboratory animals. Synonym: mouse parotid tumour virus. (22 Sep 2002) |
| wilms tumour | <radiology> Nephroblastoma, 3rd most common kiddie tumour (most common abdominal tumour), arises from embryonal renal tissue (nephroblastomatosis), large, only 10% are calcified, 4-10% bilateral, metastasis may lead to lungs, para-aortic nodes associated with: aniridia, Beckwith-Wiedemann syndrome, hemihypertrophy, Drash syndrome Cf: neuroblastoma (more likely calcified) (12 Dec 1998) |
| Wilm's tumour | <oncology, tumour> Wilm's tumour or nephroblastoma, is a cancerous tumour of the kidney in children. Wilm's is the most common tumour of the kidney and the most common intra-abdominal tumour in children. The exact cause is unknown, but probably develops in foetal tissue due to an underlying genetic factor. Like retinoblastoma, both sporadic and inherited forms occur. Believed to be caused by development of homozygosity for a deletion of the tip of the short arm of chromosome 11, which is presumed to contain a tumour suppressor gene. (07 Oct 1997) |
| Wilms' tumour | A malignant renal tumour of young children, composed of small spindle cells and various other types of tissue, including tubules and, in some cases, structures resembling foetal glomeruli, and striated muscle and cartilage. Often inherited as an autosomal dominant trait . Synonym: adenomyosarcoma, embryoma of the kidney, nephroblastoma. (05 Mar 2000) |
| wing-beating tumour | A coarse, irregular tumour that is most prominent when the limbs are held outstretched, reminiscent of a bird flapping its wings; due to up and down excursion of arm at abducted shoulder. Seen mainly with Wilson's disease. (05 Mar 2000) |
| mucoepidermoid tumour | A malignant epithelial tumour of glandular tissue, especially the salivary glands, characterised by acini with mucus-producing cells and by the presence of malignant squamous elements. most mucoepidermoid tumours are low-grade lesions readily cured by adequate excision. They may appear in any age group. They grow slowly. If high-grade, they behave aggressively, widely infiltrating the salivary gland and producing lymph node and distant metastases. (12 Dec 1998) |
| congenital sinus tumour | <radiology> Midline depression or tract, lined with stratified squamous epithelium, most common sites: lumbosacral area, occiput, epidermoid or dermoid cyst anywhere along tract (12 Dec 1998) |
| connective tumour | <oncology> Any tumour of the connective tissue group, such as osteoma, fibroma, sarcoma. (05 Mar 2000) |
| pontine angle tumour | A tumour in the angle formed by the cerebellum and the lateral pons, often refers to an acoustic schwannoma. (05 Mar 2000) |
| haarscheibe tumour | Dominantly inherited or nonfamilial elliptical parafollicular mesenchymal hamartomas. Synonym: haarscheibe tumour. (05 Mar 2000) |
| crown gall tumour | A disease which afflicts dicot plants, caused by the bacteria Agrobacterium tumefaciens. The disease causes large tumours to form in the roots or in the stems nearest the roots, deforming the plant along its base (where it meets the ground). (09 Oct 1997) |
| potato tumour of neck | A firm nodular mass in the neck, usually a carotid body tumour (chemodectoma). (05 Mar 2000) |
| Pott's puffy tumour | A circumscribed swelling of the scalp indicating an underlying osteitis of the skull or an extradural abscess. (05 Mar 2000) |
| pregnancy tumour | A pyogenic granuloma developing on the gingiva during pregnancy; thought to be related to hormonally altered response of the oral mucous membranes to local irritants such as bacterial plaque on adjacent teeth. Synonym: pregnancy tumour. (05 Mar 2000) |