| carcinoma, ehrlich tumour | A transplantable, poorly differentiated malignant tumour which appeared originally as a spontaneous breast carcinoma in a mouse. It grows in both solid and ascitic forms. (12 Dec 1998) |
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| carcinoma, embryonal | A highly malignant, primitive form of carcinoma, probably of germinal cell or teratomatous derivation, usually arising in a gonad and rarely in other sites. It is rare in the female ovary, but in the male it accounts for 20% of all testicular tumours. (12 Dec 1998) |
| carcinoma, endometrioid | Ovarian carcinoma which resembles typical carcinoma of the endometrium and may be seen with a synchronous endometrial carcinoma. When they appear together, both tend to be of low stage. (12 Dec 1998) |
| carcinoma ex pleomorphic adenoma | <tumour> Carcinoma arising in a benign mixed tumour of a salivary gland, characterised by rapid enlargement and pain. (05 Mar 2000) |
| carcinoma, giant cell | An epithelial neoplasm characterised by unusually large anaplastic cells. It is highly malignant with fulminant clinical course, bizarre histologic appearance and poor prognosis. It is most common in the lung and thyroid. (12 Dec 1998) |
| carcinoma, hepatocellular | Primary carcinoma of the liver cells. It ranges from a well-differentiated tumour difficult to distinguish from normal hepatocytes to a poorly differentiated neoplasm. The cells may be uniform or markedly pleomorphic or may form giant cells. Several classification schemes have been suggested. Hepatocellular carcinoma is very rare in the united states and western europe, but it is one of the most common cancers in eastern asia and sub-saharan africa. The cases are preponderantly male and, racially, whites have the lowest rates. (12 Dec 1998) |
| carcinoma, infiltrating duct | An invasive (infiltrating) carcinoma of the breast. This carcinoma in which no special histological feature is recognised is designated nos or not otherwise specified and is by far the most common ductal tumour, accounting for almost 70% of breast cancers. It is characterised by stony hardness upon palpation. It commonly metastasizes to the axillary lymph nodes and its prognosis is the poorest of the various ductal types. (12 Dec 1998) |
| carcinoma in situ | Cancer that involves only the cells in which it began and has not spread to other tissues. Lobular carcinoma in situ is found in the lobules of the breast. Ductal carcinoma in situ (also called intraductal carcinoma) arises in the ducts. (16 Dec 1997) |
| carcinoma, intraductal, noninfiltrating | A noninvasive (noninfiltrating) carcinoma of the breast characterised by a proliferation of malignant epithelial cells confined to the mammary ducts or lobules, without light-microscopy evidence of invasion through the basement membrane into the surrounding stroma. Its true incidence is uncertain but all noninvasive breast carcinomas comprise almost 5% of all neoplastic lesions of the female breast, with this carcinoma accounting for about 50% of these, or 2.5%-2.8% of all tumours. (12 Dec 1998) |
| carcinoma, islet cell | A carcinoma of the islets of langerhans. (12 Dec 1998) |
| carcinoma, large cell | A tumour of undifferentiated (anaplastic) cells of large size. It is usually bronchogenic. (12 Dec 1998) |
| carcinoma, lewis lung | A carcinoma discovered by dr. Margaret r. Lewis of the wistar institute in 1951. This tumour originated spontaneously as a carcinoma of the lung of a c57bl mouse. The tumour does not appear to be grossly haemorrhagic and the majority of the tumour tissue is a semifirm homogeneous mass. It is also called 3ll and llc and is used as a transplantable malignancy. (12 Dec 1998) |
| carcinoma, lobular | A infiltrating (invasive) breast cancer, relatively uncommon, accounting for only 5%-10% of breast tumours in most series. It is often an area of ill-defined thickening in the breast, in contrast to the dominant lump characteristic of ductal carcinoma. It is typically composed of small cells in a linear arrangement with a tendency to grow around ducts and lobules. There is likelihood of axillary nodal involvement with metastasis to meningeal and serosal surfaces. (12 Dec 1998) |
| carcinoma, medullary | A carcinoma composed mainly of epithelial elements with little or no stroma. Medullary carcinomas of the breast constitute 5%-7% of all mammary carcinomas; medullary carcinomas of the thyroid comprise 3%-10% of all thyroid malignancies. (12 Dec 1998) |
| carcinoma, merkel cell | A carcinoma arising from merkel cells located in the basal layer of the epidermis and occurring most commonly as a primary neuroendocrine carcinoma of the skin. Merkel cells are tactile cells of neuroectodermal origin and histologically show neurosecretory granules. The skin of the head and neck are a common site of merkel cell carcinoma, occurring generally in elderly patients. (12 Dec 1998) |