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tumor |
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tumor: see neoplasm neoplasm or tumor, tissue composed of cells that grow in an abnormal way. Normal tissue is growth-limited, i.e., cell reproduction is equal to cell death. ..... Click the link for more information. . tumour (US), tumor Pathol a. any abnormal swelling b. a mass of tissue formed by a new growth of cells, normally independent of the surrounding structures How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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2) We describe a case of a 53-year-old female with a collision tumor composed of breast carcinoma and mucosa-associated lymphoid tissue (MALT) lymphoma, invading each other and occurring as a single mass in the right breast. Several theories have been suggested, including the collision tumor theory, the conversion theory, and the clonal evolution theory. The pathologic presence of multiple different neoplasms coexisting in a single cancer lesion can result either from (1) a collision tumor, in which two or more cutaneous malignancies coincidentally collide and clinically appear as one lesion (46) or (2) a metatypical tumor, in which the epidermal keratinocytes differentiate into tumor cells of both basal cell carcinoma and squamous cell carcinoma, such as a basosquamous (or basaloid squamous cell) carcinoma. |
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