| mesonephroid tumour | A rare tumour of the female genital tract, most often the ovary, formerly considered to be derived from mesonephric rests. Two varieties are recognised: (1) clear cell carcinoma, so called because of its histologic resemblance to renal cell carcinoma, and now considered to be of muellerian duct derivation and (2) an embryonal tumour (called also endodermal sinus tumour and yolk sac tumour), occurring chiefly in children. The latter variety may also arise in the testis. (12 Dec 1998) |
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| metastatic brain tumour | A malignant growth in brain tissue that has spread from another primary cancer site (for example breast cancer, malignant melanoma, lung cancer) in the body. (27 Sep 1997) |
| Gubler's tumour | A fusiform swelling on the wrist in lead palsy. (05 Mar 2000) |
| RNA tumour virus | The family of retroviruses (Retroviridae) that can cause tumours. They are enveloped by membrane derived from the plasma membrane of the host cell, from which they are released by budding without lysing the cell. Within each virion is a pair of single stranded RNA molecules. Replication involves a DNA intermediate made on an RNA template by the enzyme reverse transcriptase. (18 Nov 1997) |
| RNA tumour viruses | Virus's of the subfamily Oncovirinae. (05 Mar 2000) |
| chromaffin tumour | <tumour> A neoplasm composed of chromaffin cells occurring in the medullae of adrenal glands, the organs of Zuckerkandl, or the paraganglia of the thoracolumbar sympathetic chain; some chromaffinoma's secrete catecholamines. See: pheochromocytoma. Synonym: chromaffin tumour. (05 Mar 2000) |
| Rous tumour | <tumour> A fibrosarcoma, originally observed in a Plymouth Rock hen, now thought to be an expression of infection by certain viruses of the avian leukosis-sarcoma complex in the family Retroviridae. Synonym: avian sarcoma, Rous tumour. (05 Mar 2000) |
| phyllodes tumour | A variant of mammary fibroadenoma, usually of large size, with an unusually cellular, sarcoma-like stroma. It is partially epithelial and partially nonepithelial. It is both common and usually benign, although it has been known to metastasize. It may achieve great size and sometimes invades adjacent breast tissue. A phyllodes tumour is best handled by local excision with a rim of breast tissue. (12 Dec 1998) |
| mixed mesodermal tumour | A sarcoma of the body of the uterus arising in older women, composed of more than one mesenchymal tissue, especially including striated muscle cells. Synonym: malignant mixed mullerian tumour. (05 Mar 2000) |
| mixed tumour | A tumour composed of two or more varieties of tissue. (05 Mar 2000) |
| mixed tumour, malignant | A malignant tumour composed of more than one type of neoplastic tissue. (12 Dec 1998) |
| mixed tumour, mesodermal | A sarcoma of the body of the uterus arising in older women, composed of more than one mesenchymal tissue, especially including striated muscle cells. It is associated with previous pelvic radiation exposure in 20% of patients. (12 Dec 1998) |
| mixed tumour, mullerian | A tumour, basically a carcinoma with a single sarcoma such as leiomyosarcoma or angiosarcoma or multiple sarcomas of uterine origin. The role of oestrogen has been postulated as a possible aetiological factor in this tumour. (holland et al., cancer medicine, 3d ed, p1703) (12 Dec 1998) |
| mixed tumour of salivary gland | A tumour composed of salivary gland epithelium and fibrous tissue with mucoid or cartilaginous areas. Synonym: pleomorphic adenoma. (05 Mar 2000) |
| mixed tumour of skin | <tumour> A benign tumour of sweat glands with a mucoid stroma showing cartilaginous metaplasia. Synonym: mixed tumour of skin. (05 Mar 2000) |