collision tumor

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col·li·sion tu·mor

two originally separate tumors, especially a carcinoma and a sarcoma, that appear to have developed by chance in close proximity, so that an area of mingling exists.
See also: carcinosarcoma.

collision tumor

Etymology: L, cum, together with, laedere, to strike
a tumor formed when two separate growths, developing close to each other, join. See also carcinoma.
(1) A generic term for the extremely rare merging of 2 originally separate—primary—tumours from 2 organs, most often seen at the oesophagogastric junction, where a squamous cell carinoma of oesophageal origin collides with a gastric adenocarcinoma; diagnosis of a collision tumour requires that the 2 tumours be histologically distinct
(2) A neuroendocrine (carcinoid) tumour characterised by discrete populations of neoplastic neuroendocrine cells and glands
References in periodicals archive ?
However, if AML and RCC form collision tumor and two kinds of histological morphology mixed, we should carefully identify the diagnosis.
31,32) Several reports have described GCTs in the breast to occur either in close proximity to an invasive adenocarcinoma (33,34) (within 2 cm) or as a component of a collision tumor with adenocarcinoma invading into the GCT component.
Based on previous reports on the positive staining of the clear cell type of RCC for CA IX, (18) we performed immunostains for this carbonic anhydrase on our collision tumor.
Subsequently, we used the staining properties of the urothelial and prostate carcinomas to verify a collision tumor in the lymph node.
This is a rare and unique entity of collision tumors of RCC coexisting with IVL.
Malignant neoplasms originating from 2 or more distinct topographic organs form a collision tumor Four instances of collision tumor of the male urogenital tract in which prostatic carcinoma was one of the components have been described.
In summary, to our knowledge this is the first reported case of a collision tumor (malignant triton tumor and ependymoma) at this anatomic location.
In one cage, the anaplastic carcinoma wag closely apposed to malignant lymphoma, large cell type, of B-cell Phenotype; this case was considered to represent a collision tumor.
Of note, the term basosquamous carcinoma is sometimes used synonymously for metatypical BCC but may also describe collision tumors between BCC and squamous cell carcinoma; therefore, this term is best accompanied by clarification of the intended definition.
7), (8) Meyer (1920) classified carcinosarcomas into three histogenetic groups: 1) collision tumors in which carcinoma and sarcoma arise simultaneously in proximity and subsequently invade each other, 2) combination tumors in which both tumors derive from pluripotent cells, and 3) composition tumors in which the components arise from the same tissue.
Congenital collision tumors, neonatal renal mesoblastic nephroma and pararenal paraganglioma.

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