A malignant biphasic neoplasm consisting of an epithelial (squamous) element and mesenchymal component is known as a carcinosarcoma (also known as pleomorphic carcinoma, spindle cell carcinoma, pseudosarcoma
, and pseudosarcomatous squamous cell carcinoma) [1, 2] although the exact nomenclature and subclassifications are variable .
SPINDLE CELL CARCINOMA (PSEUDOSARCOMA
OR SARCOMATOID CARCINOMA)
 Since these tumours consist of admixtures of both classical squamoid and spindle shaped sarcomatoid cells, different terms such as carcinosarcoma, metaplastic carcinoma, pseudosarcoma
, sarcomatoid carcinoma, spindle cell carcinoma are used to describe them.
Heterotopic mesenteric ossification: a distinctive pseudosarcoma
commonly associated with intestinal obstruction.
Melanoma in which spindle cells predominate has been termed "pseudosarcoma
Malignant tumours simulating AAM include mixed mesodermal tumours, malignant fibrous histiocytomas, botyroid pseudosarcoma
, embryonal rhabdomyosarcomas squamous cell carcinomas and extramucosal anal adenocarcinomas.
Liposarcomas have to be differentiated from benign entities such as a true lipoma or, in our patient with a BMI of 61, pseudosarcoma
of the morbidly obese.
Since then, it has also been called pseudosarcoma
, spindle cell carcinoma, and sarcomatoid carcinoma.
Carcinosarcoma is sometimes called by several other names (pseudosarcoma
, sarcomatoid carcinoma, pleomorphic carcinoma, and pseudocarcinosarcoma), not all of which are correct.
(72,82,139-150) We prefer the term inflammatory myofibroblastic tumor, which encompasses a variety of terms in the literature, including inflammatory pseudotumor, pseudosarcomatous myofibroblastic tumor, inflammatory pseudosarcomatous fibromyxoid tumor, and fibromyxoid pseudotumor; this term is reflective of the low-grade nature of this lesion and does not incite the same alarm and confusion as the terms that include pseudosarcoma
Cutaneous carcinosarcomais a biphasic malignant tumor made up of both epithelial and mesenchymal components, (2,5,6,11,13,14) Our review of the literature revealed a lack of consensus regarding terminology, as this entity is variously referred to as spindle-cell carcinoma, sarcomatoid carcinoma, metaplastic carcinoma, and pseudosarcoma
Sarcomatoid carcinoma (so-called pseudosarcoma
) of the larynx simulating malignant giant cell tumor of soft parts: a case report.