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collision tumor |
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collision tumor [kəlizh′ən] Etymology: L, cum, together with, laedere, to strike a tumor formed when two separate growths, developing close to each other, join. See also carcinoma. collision tumor, n See tumor, collision. )
Collimation of a radiographic beam.
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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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