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.