of the adrenal gland: Demonstration and characterization at MR imaging.
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.
sup] The literature reported that RCCs that coexisted with AMLs mostly were double primary tumors, and more rarely collision tumor
2) A collision tumor
is described as association of two different neoplasms in the same patient.
The differential diagnosis for this lesion included salivary gland-type tumors, a collision tumor
, and malignant transformation of a mixed glandular and squamous papilloma.
8] There are four proposed etiologic factors: (1) a carcinoma (usually squamous) with a reactive mesenchymal proliferation (pseudosarcoma), (2) a so-called collision tumor
, in which carcinoma and sarcoma arise simultaneously in a specific anatomic site, (3) a malignancy arising in an embryonic rest of epithelial and mesenchymal tissues, and (4) a divergent differentiation of a carcinoma into sarcomatous components, or sarcomatoid carcinoma.
In the case of the patient with the collision tumor
, the grossly apparent mass (a well-demarcated 1.
Even if we consider this suggestion to be true, the question of whether the tumor is a malignant meningioma or a collision tumor
still remains unanswered.
4-8) We report the case of a 52-year-old woman with vHL and metastatic RCC to a cervical spinal cord HAB in the form of a collision tumor
, where the 2 neoplastic elements lay in immediate juxtaposition, offering a unique opportunity to compare their morphologic and immunophenotypic features.
This is only the third case, to our knowledge, of such a collision tumor
reported in the literature and the only case using immunohistochemical stains to definitively distinguish the urothelial from the prostatic foci.
A collision tumor
contains 2 coexistent but independent primary neoplasms without a substantial histologic admixture at the interface.
We describe a patient with metastatic prostatic adenocarcinoma in a primary intraductal solid papillary carcinoma of the male breast, a form of collision tumor
Pathologic Diagnosis: Collision Tumor
(Malignant Triton Tumor and Ependymoma)
We believe that this case represents a collision tumor
, in which 2 thyroid tumors arose separately and then intermingled with increasing size; however, one may also hypothesize that one tumor component has arisen from the other.
All of the theories seem to point to 2 basic mechanisms, which were initially proposed by Meyer in 1919: collision tumor
or combination tumor.